"""
    Flowblade Movie Editor is a nonlinear video editor.
    Copyright 2012 Janne Liljeblad.

    This file is part of Flowblade Movie Editor <https://github.com/jliljebl/flowblade/>.

    Flowblade Movie Editor is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    Flowblade Movie Editor is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with Flowblade Movie Editor.  If not, see <http://www.gnu.org/licenses/>.
"""

"""
Module contains GUI components for displaying and editing clips in timeline.
Global timeline position and scale information is in this module.
"""
import cairo
import math

from gi.repository import Gtk
from gi.repository import Gdk
from gi.repository import GObject
from gi.repository import Pango
from gi.repository import PangoCairo

import appconsts
import audiowaveformrenderer
import callbackbridge
import cairoarea
import databridge
import editorpersistance
from editorstate import current_sequence
from editorstate import timeline_visible
from editorstate import PLAYER
from editorstate import PROJECT
from editorstate import EDIT_MODE
from editorstate import current_proxy_media_paths
import editorstate
import gui
import guiutils
import respaths
import snapping
import utils


M_PI = math.pi

REF_LINE_Y = 250 # Y pos of tracks are relative to this. This is recalculated on initialization, so value here is irrelevant.
                 # This ia a variable now not 
page_y_off = 0

MINIMUM_WIDTH = 430 # No effect on window layout we just want to put something > 0 on start.
HEIGHT = appconsts.TLINE_HEIGHT # Defines window min height together with editorwindow.TOP_ROW_HEIGHT.

# Timeline draw constants.
# Other elements than black outline are not drawn if clip screen size
# in pixels is below certain thresholds.
TEXT_MIN = 12 # If clip shorter, no text.
EMBOSS_MIN = 8 # If clip shorter, no emboss.
FILL_MIN = 1 # If clip shorter, no fill.
TEXT_X = 6
TEXT_Y_HIGH = 40
TEXT_Y = 29 
TEXT_Y_SMALL = 17
WAVEFORM_PAD_HIGH = 39
WAVEFORM_PAD_LARGE = 23
WAVEFORM_PAD_SMALL = 8
WAVEFORM_HEIGHT_HIGH = 35.0
WAVEFORM_HEIGHT_LARGE = 27.0
WAVEFORM_HEIGHT_SMALL = 17.0
MARK_PAD = 6
MARK_LINE_WIDTH = 5

# tracks column consts
COLUMN_WIDTH = 150 # column area width
SCALE_HEIGHT = 25
SCROLL_HEIGHT = 20
Y_SCROLL_WIDTH = 17
ACTIVE_SWITCH_WIDTH = 18
COMPOSITOR_HEIGHT_OFF = 10
COMPOSITOR_HEIGHT = 20
COMPOSITOR_TEXT_X = 6
COMPOSITOR_TEXT_Y = 15
COMPOSITOR_TRACK_X_PAD = 4
COMPOSITOR_TRACK_ARROW_WIDTH = 6
COMPOSITOR_TRACK_ARROW_HEAD_WIDTH = 10
COMPOSITOR_TRACK_ARROW_HEAD_WIDTH_HEIGHT = 5
ID_PAD_X = 66 # track id text pos
ID_PAD_Y_HIGH = 30 # track id text pos for high track
ID_PAD_Y = 16 # track id text pos
ID_PAD_Y_SMALL = 4 # track id text pos for small track
MUTE_ICON_POS = (5, 4)
MUTE_ICON_POS_NORMAL = (5, 14)
MUTE_ICON_POS_HIGH = (5, 30)
LOCK_POS = (34, 19)
LOCK_POS_HIGH = (34, 35)
LOCK_POS_SMALL = (34, 9)
INSRT_ICON_POS_HIGH = (134, 32)
INSRT_ICON_POS = (134, 18)
INSRT_ICON_POS_SMALL = (134, 6)
SYNC_ICON_POS_HIGH = (116, 34)
SYNC_ICON_POS = (116, 21)
SYNC_ICON_POS_SMALL = (116, 8)

# tracks column icons
FULL_LOCK_ICON = None
TRACK_BG_ICON = None
MUTE_VIDEO_ICON = None
MUTE_AUDIO_ICON = None
MUTE_AUDIO_A_ICON =  None
MUTE_ALL_ICON = None
TRACK_ALL_ON_V_ICON = None
TRACK_ALL_ON_A_ICON = None
SYNC_ICON = None

# clip icons
FILTER_CLIP_ICON = None
VIEW_SIDE_ICON = None
INSERT_ARROW_ICON = None
INSERT_ARROW_ICON_UP = None
AUDIO_MUTE_ICON = None
VIDEO_MUTE_ICON = None
ALL_MUTE_ICON = None
MARKER_ICON = None
CLIP_MARKER_ICON = None
LEVELS_RENDER_ICON = None
SNAP_ICON = None
KEYBOARD_ICON = None
CLOSE_MATCH_ICON = None
COMPOSITOR_ICON = None
TITLE_ICON = None
TC_POINTER_HEAD = None

# tc frame scale consts
SCALE_LINE_Y = 4.5 # scale horizontal line pos
SMALL_TICK_Y = 18.5 # end for tick drawn in all scales 
BIG_TICK_Y = 12.5 # end for tick drawn in most zoomed in scales
TC_Y = 13 # TC text pos in scale.
TC_X_OFF = -1 # tc x pos tuing in scale
# Timeline scale is rendered with hardcoded steps for hardcoded 
# pix_per_frame ranges.
DRAW_THRESHOLD_1 = 6 # if pix_per_frame below this, draw secs.
DRAW_THRESHOLD_2 = 4
DRAW_THRESHOLD_3 = 2
DRAW_THRESHOLD_4 = 1
# Height of sync state stripe indicating if clip is in sync or not.
SYNC_STRIPE_HEIGHT = 12
SYNC_SAW_WIDTH = 5
SYNC_SAW_HEIGHT = 5
# number on lines and tc codes displayed with small pix_per_frame values.
NUMBER_OF_LINES = 7
# Positions for 1-2 icons on clips.
ICON_SLOTS = [(14, 2),(28, 2),(42,2),(56,2)]
# Line width for moving clip boxes.
MOVE_CLIPS_LINE_WIDTH = 3.0

# Color creating utils methods.
def get_multiplied_color(color, m):
    """
    Used to create lighter and darker hues of colors.
    """
    return (color[0] * m, color[1] * m, color[2] * m)

def get_multiplied_grad(pos, alpha, grad_color, m):
    """
    Used to create lighter and darker hues of gradient colors.
    """
    return (pos, grad_color[1] * m, grad_color[2] * m, grad_color[3] * m, alpha)

def get_multiplied_color_from_grad(grad_color, m):
    """
    Used to create lighter and darker hues of gradient colors.
    """
    return (grad_color[1] * m, grad_color[2] * m, grad_color[3] * m)
    
# Colors.
GRAD_MULTIPLIER = 1.3
SELECTED_MULTIPLIER = 1.52

CLIP_TEXT_COLOR = (0, 0, 0)
CLIP_TEXT_COLOR_OVERLAY = (0.78, 0.78, 0.78, 0.6)

CLIP_COLOR_GRAD = (1,  0.20, 0.10, 0.23, 1)  #(1, 0.62, 0.38, 0.7, 1) 
CLIP_COLOR_GRAD_L = get_multiplied_grad(0, 1, CLIP_COLOR_GRAD, GRAD_MULTIPLIER) 
CLIP_SELECTED_COLOR = get_multiplied_color_from_grad(CLIP_COLOR_GRAD, SELECTED_MULTIPLIER + 0.12)
CLIP_END_DRAG_OVERLAY_COLOR = (1,1,1,0.3)

AUDIO_CLIP_COLOR_GRAD = (1, 0.09, 0.21, 0.09, 1)#(1, 0.23, 0.52, 0.23, 1)#(1, 0.79, 0.80, 0.18, 1)
AUDIO_CLIP_COLOR_GRAD_L = get_multiplied_grad(0, 1, AUDIO_CLIP_COLOR_GRAD, GRAD_MULTIPLIER)
AUDIO_CLIP_SELECTED_COLOR = ( 0.18, 0.42, 0.18)

IMAGE_CLIP_COLOR_GRAD = (1, 0.20, 0.29, 0.67, 1) # (1, 0.16, 0.26, 0.32, 1) #(1, 0.33, 0.65, 0.69, 1)
IMAGE_CLIP_COLOR_GRAD_L = get_multiplied_grad(0, 1, IMAGE_CLIP_COLOR_GRAD, GRAD_MULTIPLIER) 
IMAGE_CLIP_SELECTED_COLOR = get_multiplied_color_from_grad(IMAGE_CLIP_COLOR_GRAD, SELECTED_MULTIPLIER + 0.1)

TITLE_IMAGE_CLIP_COLOR_GRAD = (1, 0.42, 0.18, 0.70, 1) # (1, 0.16, 0.26, 0.32, 1) #(1, 0.33, 0.65, 0.69, 1)
TITLE_IMAGE_CLIP_COLOR_GRAD_L = get_multiplied_grad(0, 1, TITLE_IMAGE_CLIP_COLOR_GRAD, GRAD_MULTIPLIER) 
TITLE_IMAGE_CLIP_SELECTED_COLOR = get_multiplied_color_from_grad(TITLE_IMAGE_CLIP_COLOR_GRAD, SELECTED_MULTIPLIER + 0.1)

CONTAINER_CLIP_NOT_RENDERED_COLOR = (0.7, 0.3, 0.3)
CONTAINER_CLIP_NOT_RENDERED_SELECTED_COLOR = (0.8, 0.4, 0.4)
CONTAINER_CLIP_RENDERED_COLOR = (0.41, 0.11, 0.31) #0.16, 0.26, 0.32)
CONTAINER_CLIP_RENDERED_SELECTED_COLOR = (0.55, 0.23, 0.43) #(0.35, 0.43, 0.84)
 
COMPOSITOR_CLIP = (0.12, 0.12, 0.22, 0.7)
COMPOSITOR_CLIP_AUTO_FOLLOW = (0.33, 0.05, 0.52, 0.65)
COMPOSITOR_CLIP_SELECTED = (0.5, 0.5, 0.7, 0.8)

 # Set in load_icons_and_set_colors().
BLANK_CLIP_COLOR_GRAD = None
BLANK_CLIP_COLOR_GRAD_L = None

BLANK_CLIP_COLOR_SELECTED_GRAD = (1, 0.50, 0.50, 0.50, 1)
BLANK_CLIP_COLOR_SELECTED_GRAD_L = (0, 0.50, 0.50, 0.5, 1)

SINGLE_TRACK_TRANSITION_SELECTED = (0.8, 0.8, 1.0)

SYNC_OK_COLOR = (0.18, 0.55, 0.18)
SYNC_OFF_COLOR = (0.77, 0.20, 0.3)
SYNC_GONE_COLOR = (0.4, 0.4, 0.4)

PROXY_STRIP_COLOR = (0.40, 0.60, 0.82)
PROXY_STRIP_COLOR_SELECTED = (0.52, 0.72, 0.96)

MARK_COLOR = (0.1, 0.1, 0.1)
DARK_MARK_COLOR = (0.75, 0.75, 0.75)
MARK_OUTLINE = (0.8, 0.8, 0.8)

FRAME_SCALE_COLOR_GRAD = (1, 0.8, 0.8, 0.8, 1)
FRAME_SCALE_COLOR_GRAD_L = get_multiplied_grad(0, 1, FRAME_SCALE_COLOR_GRAD, GRAD_MULTIPLIER)

FRAME_SCALE_SELECTED_COLOR_GRAD = get_multiplied_grad(0, 1, FRAME_SCALE_COLOR_GRAD, 0.92)
FRAME_SCALE_SELECTED_COLOR_GRAD_L = get_multiplied_grad(1, 1, FRAME_SCALE_SELECTED_COLOR_GRAD, GRAD_MULTIPLIER) 

SELECTED_RANGE_COLOR = (0.7, 0.7, 0.7, 0.35)
            
DARK_FRAME_SCALE_SELECTED_COLOR_GRAD = get_multiplied_grad(0, 1, FRAME_SCALE_COLOR_GRAD, 0.6)
DARK_FRAME_SCALE_SELECTED_COLOR_GRAD_L = get_multiplied_grad(1, 1, FRAME_SCALE_SELECTED_COLOR_GRAD, GRAD_MULTIPLIER * 0.75) 

ICON_SELECTED_OVERLAY_COLOR = (0.8, 0.8, 1.0, 0.3)

# Dash pattern used by Box tool
BOX_DASH_INK = 12.0
BOX_DASH_SKIP = 3.0
BOX_DASHES = [BOX_DASH_INK, BOX_DASH_SKIP, BOX_DASH_INK, BOX_DASH_SKIP]

FRAME_SCALE_LINES = (0, 0, 0)
FRAME_SCALE_TEXT = (0, 0, 0)

BG_COLOR = (0.5, 0.5, 0.55)
FRAME_SCALE_NEUTRAL_BG_COLOR = ((35.0/255.0) + 0.02, (35.0/255.0) + 0.02, (35.0/255.0) + 0.02)
THEME_NEUTRAL_COLUMN_BG_COLOR = (41.7/255.0, 41.7/255.0, 41.7/255.0)

COLUMN_NOT_ACTIVE_COLOR = (0.32, 0.32, 0.34)
COLUMN_ACTIVE_COLOR  = (0.063, 0.341, 0.659)

OVERLAY_COLOR = (0.9,0.9,0.9)
OVERLAY_SELECTION_COLOR = (0.9,0.9,0.0)
CLIP_OVERLAY_COLOR = (0.2, 0.2, 0.9, 0.5)
OVERWRITE_OVERLAY_COLOR = (0.2, 0.2, 0.2, 0.5)
INSERT_MODE_COLOR = (0.9,0.9,0.0)
OVERWRITE_MODE_COLOR = (0.9,0.0,0.0)
OVERLAY_TRIM_COLOR = (0.81, 0.82, 0.3)
OVERLAY_TRIM_OVERWRITE_COLOR = (0.81, 0.3, 0.3)
BOX_BOUND_COLOR =(0.8, 0.8, 0.8, 0.3)
TRIM_MAX_RED = (1.0,0.1,0.1)

POINTER_TRIANGLE_COLOR = (0.6, 0.7, 0.8, 0.7)
SHADOW_POINTER_COLOR = (0.5, 0.5, 0.5)

MATCH_FRAME_LINES_COLOR = (0.78, 0.31, 0.31)

BLANK_SELECTED = (0.68, 0.68, 0.74)

TRACK_NAME_COLOR = (0.0,0.0,0.0)

 # Set in load_icons_and_set_colors().
TRACK_GRAD_STOP1 = None
TRACK_GRAD_STOP3 = None

 # Set in load_icons_and_set_colors(). Not orange anymore, huh.
TRACK_GRAD_ORANGE_STOP1 = None
TRACK_GRAD_ORANGE_STOP3 = None

Y_SCROLL_BG = (0.17, 0.17, 0.17)
 
DARK_THEME_COLUMN_BG = ((62.0/255.0), (62.0/255.0), (62.0/255.0))

LIGHT_MULTILPLIER = 1.14
DARK_MULTIPLIER = 0.74



# ------------------------------------------------------------------ MODULE POSITION STATE
# ------------------------------------------------------------------ MODULE POSITION STATE
# ------------------------------------------------------------------ MODULE POSITION STATE

pix_per_frame = 5.0 # Current draw scale. This is set elsewhere on init so default value irrelevant.
pos = 0 # Current left most frame in timeline display

# ------------------------------------------------------------------ MODULE POSITION STATE
# ------------------------------------------------------------------ MODULE POSITION STATE
# ------------------------------------------------------------------ MODULE POSITION STATE

# Used to implement 'zoom on mouse position' feature.
zoom_mouse_x = 0.0

# For debug purposes.
draw_blank_borders = True

# A context defining action taken when mouse press happens based on edit mode and mouse position.
# Cursor communicates current pointer contest to user.
pointer_context = appconsts.POINTER_CONTEXT_NONE
DRAG_SENSITIVITY_AREA_WIDTH_PIX = 6
MULTI_TRIM_ROLL_SENSITIVITY_AREA_WIDTH_PIX = 2
MULTI_TRIM_SLIP_SENSITIVITY_AREA_WIDTH_PIX = 20
MULTI_TRIM_ENDS_SENSITIVITY_AREA_WIDTH_PIX = 18

# ref to singleton TimeLineCanvas instance for mode setting and some position
# calculations.
canvas_widget = None

# Used to draw trim modes differently when moving from <X>_NO_EDIT mode to active edit.
trim_mode_in_non_active_state = False

# Used ahen editing with SLIDE_TRIM mode to make user believe that the frame being displayed 
# is the view frame user selected while in reality user is displayed images from hidden track and the
# current frame is moving in opposite direction to users mouse movement.
fake_current_frame = None

# Used to draw indicators that tell if more frames are available while trimming.
trim_status = appconsts.ON_BETWEEN_FRAME

# Dict for clip thumbnails path -> image.
clip_thumbnails = {}



# ------------------------------------------------------------------- module functions
def load_icons_and_set_colors():
    global FULL_LOCK_ICON, FILTER_CLIP_ICON, VIEW_SIDE_ICON,\
    COMPOSITOR_ICON, INSERT_ARROW_ICON, INSERT_ARROW_ICON_UP, AUDIO_MUTE_ICON, MARKER_ICON, \
    VIDEO_MUTE_ICON, ALL_MUTE_ICON, TRACK_BG_ICON, MUTE_AUDIO_ICON, MUTE_VIDEO_ICON, MUTE_ALL_ICON, \
    TRACK_ALL_ON_V_ICON, TRACK_ALL_ON_A_ICON, MUTE_AUDIO_A_ICON, TC_POINTER_HEAD, EDIT_INDICATOR, \
    LEVELS_RENDER_ICON, SNAP_ICON, KEYBOARD_ICON, CLOSE_MATCH_ICON, CLIP_MARKER_ICON, \
    INSERT_ARROW_ICON_INACTIVE, INSERT_ARROW_ICON_UP_INACTIVE, TITLE_ICON, SYNC_ICON 

    FULL_LOCK_ICON = cairo.ImageSurface.create_from_png(respaths.IMAGE_PATH + "full_lock.png")
    FILTER_CLIP_ICON = cairo.ImageSurface.create_from_png(respaths.IMAGE_PATH + "filter_clip_icon_sharp.png")
    VIEW_SIDE_ICON = cairo.ImageSurface.create_from_png(respaths.IMAGE_PATH + "view_side.png")
    INSERT_ARROW_ICON = cairo.ImageSurface.create_from_png(respaths.IMAGE_PATH + "insert_arrow.png")
    AUDIO_MUTE_ICON = cairo.ImageSurface.create_from_png(respaths.IMAGE_PATH +"clip_audio_mute.png")
    VIDEO_MUTE_ICON = cairo.ImageSurface.create_from_png(respaths.IMAGE_PATH +"clip_video_mute.png")
    ALL_MUTE_ICON = cairo.ImageSurface.create_from_png(respaths.IMAGE_PATH + "clip_all_mute.png")
    TRACK_BG_ICON = cairo.ImageSurface.create_from_png(respaths.IMAGE_PATH + "track_bg.png")
    MUTE_AUDIO_ICON = cairo.ImageSurface.create_from_png(respaths.IMAGE_PATH + "track_audio_mute.png")
    MUTE_VIDEO_ICON = cairo.ImageSurface.create_from_png(respaths.IMAGE_PATH + "track_video_mute.png")
    MUTE_ALL_ICON = cairo.ImageSurface.create_from_png(respaths.IMAGE_PATH + "track_all_mute.png")
    LEVELS_RENDER_ICON = cairo.ImageSurface.create_from_png(respaths.IMAGE_PATH + "audio_levels_render.png")
    SNAP_ICON = cairo.ImageSurface.create_from_png(respaths.IMAGE_PATH + "snap_magnet.png")
    KEYBOARD_ICON = cairo.ImageSurface.create_from_png(respaths.IMAGE_PATH + "keyb_trim.png")
    CLOSE_MATCH_ICON = cairo.ImageSurface.create_from_png(respaths.IMAGE_PATH + "close_match.png")
    CLIP_MARKER_ICON = cairo.ImageSurface.create_from_png(respaths.IMAGE_PATH + "clip_marker.png")
    SYNC_ICON = cairo.ImageSurface.create_from_png(respaths.IMAGE_PATH + "track_sync_icon.png")
    COMPOSITOR_ICON = guiutils.get_cairo_image("compositor_icon")
    TITLE_ICON = guiutils.get_cairo_image("open_titler")
        
    MARKER_ICON = _load_pixbuf("marker_yellow.png")
    TC_POINTER_HEAD = _load_pixbuf("tc_pointer_head.png")
    EDIT_INDICATOR = _load_pixbuf("clip_edited.png")

    global FRAME_SCALE_COLOR_GRAD, FRAME_SCALE_COLOR_GRAD_L, BG_COLOR, FRAME_SCALE_LINES, FRAME_SCALE_TEXT, TRACK_GRAD_STOP1, TRACK_GRAD_STOP3, TRACK_NAME_COLOR,  \
            TRACK_GRAD_ORANGE_STOP1, TRACK_GRAD_ORANGE_STOP3, BLANK_CLIP_COLOR_GRAD, BLANK_CLIP_COLOR_GRAD_L, COLUMN_NOT_ACTIVE_COLOR

    FRAME_SCALE_LINES = (0.5, 0.5, 0.5)
    FRAME_SCALE_TEXT = (0.65, 0.65, 0.65)
    FRAME_SCALE_COLOR_GRAD = (1, 0.3, 0.3, 0.3, 1)
    FRAME_SCALE_COLOR_GRAD_L = get_multiplied_grad(0, 1, FRAME_SCALE_COLOR_GRAD, GRAD_MULTIPLIER)
    BG_COLOR = (0.44, 0.44, 0.46)

    TRACK_NAME_COLOR = (0.68, 0.68, 0.68)
    TRACK_ALL_ON_V_ICON = _load_pixbuf("track_all_on_V_fb.png", True)
    TRACK_ALL_ON_A_ICON = _load_pixbuf("track_all_on_A_fb.png", True)
    MUTE_AUDIO_ICON = _load_pixbuf("track_audio_mute_fb.png", True)
    MUTE_VIDEO_ICON = _load_pixbuf("track_video_mute_fb.png", True)
    MUTE_ALL_ICON = _load_pixbuf("track_all_mute_fb.png", True)
    MUTE_AUDIO_A_ICON = _load_pixbuf("track_audio_mute_A_fb.png", True)
    INSERT_ARROW_ICON = cairo.ImageSurface.create_from_png(respaths.IMAGE_PATH + "insert_arrow_fb.png")
    INSERT_ARROW_ICON_UP = cairo.ImageSurface.create_from_png(respaths.IMAGE_PATH + "insert_arrow_up_fb.png")
    INSERT_ARROW_ICON_INACTIVE = cairo.ImageSurface.create_from_png(respaths.IMAGE_PATH + "insert_arrow_inactive_fb.png")
    INSERT_ARROW_ICON_UP_INACTIVE = cairo.ImageSurface.create_from_png(respaths.IMAGE_PATH + "insert_arrow_up_inactive_fb.png")

    # Tracks column track color
    r = g = b = 0.190
        
    BLANK_CLIP_COLOR_GRAD = (1, 0.20, 0.20, 0.20, 1)
    BLANK_CLIP_COLOR_GRAD_L = (1, 0.20, 0.20, 0.20, 1)
                
    TRACK_GRAD_STOP1 = (1, r, g ,b , 1)
    TRACK_GRAD_STOP3 = (0, r, g ,b , 1)
    rl, gl, bl, = get_multiplied_color((r, g ,b), 1.25)
    TRACK_GRAD_ORANGE_STOP1 = (1, rl, gl, bl, 1) # V1
    TRACK_GRAD_ORANGE_STOP3 = (1, rl, gl, bl, 1) # V1

    COLUMN_NOT_ACTIVE_COLOR = (0.40, 0.40, 0.40)


    
def update_clip_thumbnail(media_file):
    global clip_thumbnails

    clip_thumbnails[media_file.path] = media_file.icon

def set_tracks_height_consts():
    global ID_PAD_Y_HIGH, ID_PAD_Y, ID_PAD_Y_SMALL, MUTE_ICON_POS, MUTE_ICON_POS_NORMAL, \
    MUTE_ICON_POS_HIGH, LOCK_POS, LOCK_POS_HIGH, LOCK_POS_SMALL, INSRT_ICON_POS, INSRT_ICON_POS_SMALL, INSRT_ICON_POS_HIGH, \
    WAVEFORM_PAD_LARGE, WAVEFORM_PAD_SMALL, HEIGHT, WAVEFORM_PAD_HIGH, SYNC_ICON_POS_HIGH, SYNC_ICON_POS, SYNC_ICON_POS_SMALL

    if editorpersistance.prefs.tracks_scale == appconsts.TRACKS_SCALE_DOUBLE:
        HEIGHT = appconsts.TLINE_HEIGHT
        ID_PAD_Y_HIGH = 66
        ID_PAD_Y = 41
        ID_PAD_Y_SMALL = 16
        MUTE_ICON_POS = (5, 16)
        MUTE_ICON_POS_NORMAL = (5, 40)
        MUTE_ICON_POS_HIGH = (5, 64)
        LOCK_POS = (34, 45)
        LOCK_POS_HIGH = (34, 69)
        LOCK_POS_SMALL = (34, 21)
        INSRT_ICON_POS_HIGH = (134, 66) 
        INSRT_ICON_POS = (134, 43)
        INSRT_ICON_POS_SMALL =  (134, 18)
        WAVEFORM_PAD_LARGE = 77
        WAVEFORM_PAD_SMALL = 33
        SYNC_ICON_POS_HIGH = (116, 70)
        SYNC_ICON_POS = (116, 45)
        SYNC_ICON_POS_SMALL = (116, 20)
    elif editorpersistance.prefs.tracks_scale == appconsts.TRACKS_SCALE_ONE_AND_HALF:
        HEIGHT = appconsts.TLINE_HEIGHT
        ID_PAD_Y_HIGH = 48
        ID_PAD_Y = 29
        ID_PAD_Y_SMALL = 9
        MUTE_ICON_POS = (5, 10)
        MUTE_ICON_POS_NORMAL = (5, 30)
        MUTE_ICON_POS_HIGH = (5, 49)
        LOCK_POS = (34, 35)
        LOCK_POS_HIGH = (34, 54)
        LOCK_POS_SMALL = (34, 15)
        INSRT_ICON_POS_HIGH = (134, 51) 
        INSRT_ICON_POS = (134, 32)
        INSRT_ICON_POS_SMALL =  (134, 12)
        WAVEFORM_PAD_LARGE = 47
        WAVEFORM_PAD_SMALL = 20
        WAVEFORM_PAD_HIGH = 77
        SYNC_ICON_POS_HIGH = (116, 53)
        SYNC_ICON_POS = (116, 34)
        SYNC_ICON_POS_SMALL = (116, 14)

def set_dark_bg_color():
    global BG_COLOR
    
    r, g, b, a = gui.unpack_gdk_color(gui.get_bg_color())    
    BG_COLOR = (35.0/255.0, 35.0/255.0, 35.0/255.0)

def _load_pixbuf(icon_name, double_for_double_track_heights=False):
    return cairo.ImageSurface.create_from_png(respaths.IMAGE_PATH + icon_name)

def set_ref_line_y(allocation):
    """
    Sets value of REF_LINE_Y to such that tracks are vertically centered.
    """
    try:
        total_h = 0
        below_ref_h = 0
        for i in range(1, len(current_sequence().tracks) - 1):
            total_h += current_sequence().tracks[i].height
            if i < current_sequence().first_video_index:
                below_ref_h += current_sequence().tracks[i].height

        x, y, w, panel_height = allocation.x, allocation.y, allocation.width, allocation.height
        centerered_tracks_bottom_y = (panel_height / 2.0) + (total_h / 2.0)
        global REF_LINE_Y
        REF_LINE_Y = int(centerered_tracks_bottom_y - below_ref_h) + page_y_off
    except:
        print("tlinewidgets.set_ref_line_y() failed")

def get_pos_for_tline_centered_to_current_frame():
    current_frame = PLAYER().current_frame()
    allocation = canvas_widget.widget.get_allocation()
    x, y, w, h = allocation.x, allocation.y, allocation.width, allocation.height
    frames_in_panel = w / pix_per_frame

    if current_frame < (frames_in_panel / 2.0):
        return 0
    else:
        return current_frame - (frames_in_panel / 2)

def get_mouse_pos_frame():
    return get_frame(zoom_mouse_x)

def get_pos_for_tline_centered_to_mouse_frame(mouse_pos_frame_pre_zoom):
    mouse_pos_frame_after_zoom = get_frame(zoom_mouse_x)
    new_pos = pos - (mouse_pos_frame_after_zoom - mouse_pos_frame_pre_zoom)

    if new_pos < 0:
        return 0
    else:
        return new_pos

def get_last_tline_view_frame():
    allocation = canvas_widget.widget.get_allocation()
    x, y, w, h = allocation.x, allocation.y, allocation.width, allocation.height
    frames_in_panel = w / pix_per_frame
    return int(pos + frames_in_panel)

def get_frame(panel_x):
    """
    Returns frame for panel x position
    """
    return int(pos + (panel_x / pix_per_frame))

def get_track(panel_y):
    """
    Returns track object for y or None
    """
    audio_add = 0
    for i in range(1, current_sequence().first_video_index):
        audio_add = audio_add + current_sequence().tracks[i].height

    bottom_line = REF_LINE_Y + audio_add
    if panel_y > bottom_line:
        return None
        
    tracks_height = bottom_line
    for i in range(1, len(current_sequence().tracks)):
        tracks_height = tracks_height - current_sequence().tracks[i].height
        if tracks_height < panel_y:
            return current_sequence().tracks[i]
    
    return None

def get_clip_track_and_index_for_pos(x, y):
    # Returns tuple (clip, track, index)
    track = get_track(y)
    if track == None:
        return (None, None, -1)

    frame = get_frame(x)
    clip_index = current_sequence().get_clip_index(track, frame)
    if clip_index == -1:
        return (None, None, -1)
    
    return (track.clips[clip_index], track, clip_index)

def _get_track_y(track_index):
    """
    NOTE: FUNCTION NOT REALLY INTERNAL TO MODULE, HAS OUTSIDE USERS.
    Returns y pos in canvas for track index. y is top most pixel in track 
    """
    audio_add = 0
    for i in range(1, current_sequence().first_video_index):
        audio_add = audio_add + current_sequence().tracks[i].height

    bottom_line = REF_LINE_Y + audio_add
    tracks_height = 0
    for i in range(1, track_index + 1):
        tracks_height = tracks_height + current_sequence().tracks[i].height
    
    return bottom_line - tracks_height
    
def _get_frame_x(frame):
    """
    NOTE: NOT REALLY INTERNAL TO MODULE, HAS OUTSIDE USERS.
    Returns x pos in canvas for timeline frame
    """
    disp_frame = frame - pos
    return disp_frame * pix_per_frame

def compositor_hit(frame, x, y, sorted_compositors):
    """
    Returns compositor hit with mouse press x,y or None if nothing hit.
    """
    track = get_track(y)
    try:
        track_top = _get_track_y(track.id)
    except AttributeError: # we didn't press on a editable track
        return None

    if editorstate.get_compositing_mode() == appconsts.COMPOSITING_MODE_STANDARD_FULL_TRACK:
        return None
    
    # Test if compositor hit on track top, so compositor hit on dest track side
    if y >= track_top and y < track_top + (COMPOSITOR_HEIGHT - COMPOSITOR_HEIGHT_OFF):
       return _comp_hit_on_below_track(frame, track, sorted_compositors)
       
    # Test if compositor hit on track bottom, so compositor hit on source track side      
    elif y >= (track_top + track.height - COMPOSITOR_HEIGHT_OFF) and y <=(track_top + track.height):
       return _comp_hit_on_source_track(frame, track, sorted_compositors)

    # Hit y is on he stripe where no compositors can be hit
    else:
        return None

def _comp_hit_on_below_track(frame, track, sorted_compositors):
    for comp in sorted_compositors:
        if comp.transition.b_track - 1 == track.id:
            if comp.clip_in <= frame and comp.clip_out >= frame:
                return comp
    return None

def _comp_hit_on_source_track(frame, track, sorted_compositors):
    for comp in sorted_compositors:
        if comp.transition.b_track == track.id:
            if comp.clip_in <= frame and comp.clip_out >= frame:
                return comp
    return None

def _get_standard_mode_compositor_rect(scale_in, scale_length, y):
    scale_mid = int(scale_in) + int(scale_length) // 2
    y = int(y) - 8.0
    side_half = 11
    
    return (scale_mid - side_half, y, side_half * 2, side_half * 2)
        
# --------------------------------------- edit mode overlay draw handling
def set_edit_mode(data, draw_func):
    global canvas_widget
    canvas_widget.edit_mode_data = data
    canvas_widget.edit_mode_overlay_draw_func = draw_func
    
def set_edit_mode_data(data):
    global canvas_widget
    canvas_widget.edit_mode_data = data
        
def draw_insert_overlay(cr, data):
    """
    Overlay for insert move edit mode
    """
    # Only draw if were moving
    if data == None:
        return
    if data["move_on"] == False:
        return

    target_track = data["to_track_object"]
    y = _get_track_y(target_track.id)
    
    _draw_move_overlay(cr, data, y)
    
    insert_frame = data["insert_frame"]
    insert_frame_x = _get_frame_x(insert_frame)    
    _draw_mode_arrow(cr, insert_frame_x, y, INSERT_MODE_COLOR)

def draw_overwrite_overlay(cr, data):
    # Only draw if were moving
    if data == None:
        return
    if data["move_on"] == False:
        return
    
    target_track = data["to_track_object"]
    y = _get_track_y(target_track.id)
    start_x = _get_frame_x(data["over_in"])
    end_x = _get_frame_x(data["over_out"])
    
    track_height = target_track.height
    _draw_overwrite_clips_overlay(cr, start_x, end_x, y, track_height)

    _draw_move_overlay(cr, data, y)

    arrow_x = start_x + ((end_x - start_x)/2.0)
    _draw_mode_arrow(cr, arrow_x, y, OVERWRITE_MODE_COLOR)
    
    _draw_snap(cr, y)

def draw_overwrite_box_overlay(cr, data):
    # Only draw if were moving
    if data == None:
        return
    if data["action_on"] == False:
        return

    if data["box_selection_data"] == None: # mouse action selection
        x1, y1 = data["press_point"]
        x2, y2 = data["mouse_point"]
        cr.set_line_width(2.0)
        cr.set_source_rgb(*OVERLAY_COLOR)
        cr.move_to(x1, y1)
        cr.line_to(x1, y2)
        cr.line_to(x2, y2)
        cr.line_to(x2, y1)
        cr.close_path()
        cr.stroke()
    else: # mouse action move

        # Draw clips in draw range
        cr.set_line_width(MOVE_CLIPS_LINE_WIDTH)
        cr.set_source_rgb(*OVERLAY_COLOR)
        
        s_data = data["box_selection_data"]

        # Draw moved clips
        cr.set_source_rgba(*BOX_BOUND_COLOR)
        for i in range(0, len(s_data.track_selections)):
            track_selection = s_data.track_selections[i]
            y = _get_track_y(track_selection.track_id)
            clip_start_frame = track_selection.range_frame_in - pos + data["delta"]
            track_height = current_sequence().tracks[track_selection.track_id].height
            
            for i in range(0, len(track_selection.clip_lengths)):
                clip_length = track_selection.clip_lengths[i]
                if track_selection.clip_is_media[i] == True:
                    scale_length = clip_length * pix_per_frame
                    scale_in = clip_start_frame * pix_per_frame
                    cr.rectangle(scale_in, y + 1.5, scale_length, track_height - 2.0)
                    cr.stroke()
                clip_start_frame += clip_length
        
        # Draw moved compositors
        for comp in s_data.selected_compositors:
            comp_in = comp.clip_in - pos + data["delta"]
            comp_out = comp.clip_out - pos + data["delta"]
            track = current_sequence().tracks[comp.transition.b_track]
            y = _get_track_y(comp.transition.b_track) + track.height - COMPOSITOR_HEIGHT_OFF
            track_height = current_sequence().tracks[comp.transition.b_track].height
            scale_length = (comp_out - comp_in) * pix_per_frame
            scale_in = comp_in * pix_per_frame
            target_track = current_sequence().tracks[comp.transition.a_track]
            target_y = _get_track_y(target_track.id) + target_track.height - COMPOSITOR_HEIGHT_OFF
                
            _create_compositor_cairo_path(cr, scale_in, scale_length, y, target_y)
    
            cr.set_source_rgba(*BOX_BOUND_COLOR)
            cr.stroke()
                    
        # Draw bounding box
        cr.set_line_width(6.0)
        cr.set_source_rgba(*BOX_BOUND_COLOR)
        x = (s_data.topleft_frame  - pos + data["delta"]) * pix_per_frame
        w = s_data.width_frames * pix_per_frame
        y = _get_track_y(s_data.topleft_track)
        bottom_track = s_data.topleft_track - s_data.height_tracks + 1
        y2 = _get_track_y(bottom_track) + current_sequence().tracks[bottom_track].height
        cr.move_to(x, y)
        cr.line_to(x + w, y)
        cr.line_to(x + w, y2)
        cr.line_to(x, y2)
        cr.close_path()
        cr.set_dash(BOX_DASHES, 0) 
        cr.stroke()

        # Draw move arrows
        draw_x = x - 6
        draw_y = y + (y2 - y) / 2.0
        size = 9
        cr.set_source_rgb(*OVERLAY_COLOR)
        cr.move_to(draw_x, draw_y)
        cr.line_to(draw_x, draw_y - size)
        cr.line_to(draw_x - size, draw_y)
        cr.line_to(draw_x, draw_y + size)
        cr.close_path()
        cr.fill()

        draw_x = x + w + 6
        cr.move_to(draw_x, draw_y)
        cr.line_to(draw_x, draw_y - size)
        cr.line_to(draw_x + size, draw_y)
        cr.line_to(draw_x, draw_y + size)
        cr.close_path()
        cr.fill()

        if editorpersistance.prefs.delta_overlay == True:
            delta = data["delta"]       
            tc_str = utils.get_tc_string_short(abs(delta))
            tc_str = _get_signed_tc_str(tc_str, delta)
                
            _draw_text_info_box(cr, x, y - 12, tc_str)

        _draw_snap(cr, y)
    
def _draw_move_overlay(cr, data, y):
    # Get data
    press_frame = data["press_frame"]
    current_frame = data["current_frame"]
    first_clip_start = data["first_clip_start"]
    clip_lengths = data["clip_lengths"]
    track_height = data["to_track_object"].height

    # Get first frame for drawing shadow clips
    delta = current_frame - press_frame
    draw_start = first_clip_start + delta
    clip_start_frame = draw_start - pos
        
    # Draw clips in draw range
    cr.set_line_width(MOVE_CLIPS_LINE_WIDTH)
    cr.set_source_rgb(*OVERLAY_COLOR)
    for i in range(0, len(clip_lengths)):
        clip_length = clip_lengths[i]
        
        scale_length = clip_length * pix_per_frame
        scale_in = clip_start_frame * pix_per_frame
        cr.rectangle(scale_in, y + 1.5, scale_length, track_height - 2.0)
        cr.stroke()
        
        # Start frame for next clip
        clip_start_frame += clip_length

    if editorpersistance.prefs.delta_overlay == True:
        x = (draw_start - pos) * pix_per_frame
        
        tc_str = utils.get_tc_string_short(abs(delta))
        tc_str = _get_signed_tc_str(tc_str, delta)
            
        _draw_text_info_box(cr, x, y - 12, tc_str)

def draw_multi_overlay(cr, data):
    if data == None:
        return

    press_frame = data["press_frame"]
    current_frame = data["current_frame"]
    min_allowed_delta = - data["multi_data"].max_backwards
    first_moved_frame = data["first_moved_frame"]
    move_all = data["multi_data"].move_all_tracks

    delta = current_frame - press_frame
    if delta <= min_allowed_delta:
        delta = min_allowed_delta
        can_move_back = False
    else:
        can_move_back = True

    draw_y = _get_track_y(0) + 100
    cr.set_line_width(1.0)

    first_frame = first_moved_frame - pos
    first_x = first_frame * pix_per_frame

    draw_frame = first_moved_frame + delta - pos
    draw_x = draw_frame * pix_per_frame

    if move_all:
        cr.rectangle(first_x, 0, draw_x - first_x, draw_y)
        cr.set_source_rgba(0,0,0,0.2)
        cr.fill()
        cr.set_source_rgb(*OVERLAY_COLOR)
        cr.move_to(draw_x, 0)
        cr.line_to(draw_x, draw_y)
        cr.stroke()
    else:
        moved_track_index = data["multi_data"].pressed_track_id
        draw_y = _get_track_y(moved_track_index)
        h = current_sequence().tracks[moved_track_index].height
        cr.rectangle(first_x, draw_y, draw_x - first_x,  h)
        cr.set_source_rgba(0,0,0,0.2)
        cr.fill()
        cr.set_source_rgb(*OVERLAY_COLOR)
        cr.move_to(draw_x, draw_y - 5)
        cr.line_to(draw_x, draw_y + h + 10)
        cr.stroke()

    tracks = current_sequence().tracks
    track_moved = data["multi_data"].track_affected
    for i in range(1, len(tracks) - 1):
        if not track_moved[i - 1]:
            continue
        track = tracks[i]
        draw_y = _get_track_y(i) + track.height / 2
        cr.move_to(draw_x + 2, draw_y)
        cr.line_to(draw_x + 2, draw_y - 5)
        cr.line_to(draw_x + 7, draw_y)
        cr.line_to(draw_x + 2, draw_y + 5)
        cr.close_path()
        cr.fill()
        if can_move_back:
            cr.move_to(draw_x - 2, draw_y)
            cr.line_to(draw_x - 2, draw_y - 5)
            cr.line_to(draw_x - 7, draw_y)
            cr.line_to(draw_x - 2, draw_y + 5)
            cr.close_path()
            cr.fill()

    y = _get_track_y(current_sequence().first_video_index)

    if editorpersistance.prefs.delta_overlay == True:        
        tc_str = utils.get_tc_string_short(abs(delta))
        tc_str = _get_signed_tc_str(tc_str, delta)
            
        _draw_text_info_box(cr, draw_x, y - 12, tc_str)
    
    _draw_snap(cr, y)
    
def draw_two_roll_overlay(cr, data):
    edit_frame = data["edit_frame"]
    frame_x = _get_frame_x(edit_frame)
    track_height = current_sequence().tracks[data["track"]].height
    track_y = _get_track_y(data["track"])
    cr.set_source_rgb(*OVERLAY_COLOR)
    cr.move_to(frame_x, track_y - 3)
    cr.line_to(frame_x, track_y + track_height + 3)
    cr.stroke()

    selection_frame_x = _get_frame_x(data["selected_frame"])

    cr.set_source_rgb(*OVERLAY_SELECTION_COLOR)
    cr.move_to(selection_frame_x - 0.5, track_y - 6.5)
    cr.line_to(selection_frame_x - 0.5, track_y + track_height + 6.5)
    cr.stroke()

    if data["to_side_being_edited"]:
        _draw_view_icon(cr, frame_x + 6, track_y + 1)
    else:
        _draw_view_icon(cr, frame_x - 18, track_y + 1)

    trim_limits = data["trim_limits"]
    clip_over_start_x = _get_frame_x(trim_limits["both_start"] - 1) # trim limits leave 1 frame non-trimmable
    clip_over_end_x = _get_frame_x(trim_limits["both_end"] + 1) # trim limits leave 1 frame non-trimmable
    cr.set_line_width(2.0)  
    _draw_trim_clip_overlay(cr, clip_over_start_x, clip_over_end_x, track_y, track_height, False, (1,1,1,0.3))

    cr.set_line_width(1.0)
    cr.move_to(clip_over_start_x - 0.5, track_y - 6.5)
    cr.line_to(clip_over_start_x - 0.5, track_y + track_height + 6.5)
    cr.stroke()

    cr.move_to(clip_over_end_x - 0.5, track_y - 6.5)
    cr.line_to(clip_over_end_x - 0.5, track_y + track_height + 6.5)
    cr.stroke()

    if trim_status != appconsts.ON_BETWEEN_FRAME:
        if trim_status == appconsts.ON_FIRST_FRAME:
            _draw_end_triangles(cr, selection_frame_x, track_y, track_height, 6)
        else:
            _draw_end_triangles(cr, selection_frame_x, track_y, track_height, -6)

    radius = 5.0
    degrees = M_PI/ 180.0
    bit = 3
    if not trim_mode_in_non_active_state:
        cr.set_source_rgb(0.9, 0.9, 0.2)
    else:
        cr.set_source_rgb(0.2, 0.2, 0.2)
    cr.set_line_width(2.0)
    cr.move_to(selection_frame_x + radius + bit, track_y + track_height)
    cr.arc (selection_frame_x + radius, track_y + track_height - radius, radius, 90 * degrees, 180.0 * degrees) 
    cr.arc (selection_frame_x + radius, track_y + radius, radius,  180.0 * degrees, 270.0 * degrees)
    cr.line_to(selection_frame_x + radius + bit, track_y)
    cr.stroke()
    cr.move_to(selection_frame_x - radius - bit, track_y)
    cr.arc (selection_frame_x - radius, track_y + radius, radius,  -90.0 * degrees, 0.0 * degrees)
    cr.arc (selection_frame_x - radius, track_y + track_height - radius, radius, 0 * degrees, 90.0 * degrees)
    cr.line_to(selection_frame_x - radius - bit, track_y + track_height)
    cr.stroke()

    if editorpersistance.prefs.delta_overlay == True:
        delta = data["selected_frame"] - data["edit_frame"]        
        tc_str = utils.get_tc_string_short(abs(delta))
        tc_str = _get_signed_tc_str(tc_str, delta)
            
        _draw_text_info_box(cr, selection_frame_x + 3, track_y - 12, tc_str)

    _draw_kb_trim_indicator(cr, selection_frame_x, track_y)
    _draw_snap(cr, track_y)
    
def draw_one_roll_overlay(cr, data):
    track_height = current_sequence().tracks[data["track"]].height
    track_y = _get_track_y(data["track"])
    
    selection_frame_x = _get_frame_x(data["selected_frame"])

    trim_limits = data["trim_limits"]
    if data["to_side_being_edited"]:
        # Case: editing to-clip
        first = data["selected_frame"]
        last = trim_limits["both_end"] + 1
        if trim_limits["ripple_display_end"] != -1:
            last = trim_limits["ripple_display_end"]
        x = _get_frame_x(last)

    else:
        # Case: editing from-clip
        first = trim_limits["both_start"] - 1
        if trim_limits["ripple_display_start"] != -1:
            first = trim_limits["ripple_display_start"]
        last = data["selected_frame"]
        x = _get_frame_x(first)

    cr.set_line_width(1.0)
    cr.set_source_rgb(*OVERLAY_COLOR)
    cr.move_to(x, track_y - 6.5)
    cr.line_to(x, track_y + track_height + 6.5)
    cr.stroke()
        
    cr.set_line_width(2.0)
    _draw_trim_clip_overlay(cr, _get_frame_x(first), _get_frame_x(last), track_y, track_height, False, (1,1,1,0.3))
        
    cr.set_source_rgb(*OVERLAY_SELECTION_COLOR)
    cr.move_to(selection_frame_x - 0.5, track_y - 6.5)
    cr.line_to(selection_frame_x - 0.5, track_y + track_height + 6.5)
    cr.stroke()

    if trim_status != appconsts.ON_BETWEEN_FRAME:
        if trim_status == appconsts.ON_FIRST_FRAME:
            _draw_end_triangles(cr, selection_frame_x, track_y, track_height, 6)
        else:
            _draw_end_triangles(cr, selection_frame_x, track_y, track_height, -6)

    radius = 5.0
    degrees = M_PI/ 180.0
    bit = 3
    if not trim_mode_in_non_active_state:
        cr.set_source_rgb(0.9, 0.9, 0.2)
    else:
        cr.set_source_rgb(0.2, 0.2, 0.2)
    cr.set_line_width(2.0)
    if data["to_side_being_edited"]:
        cr.move_to(selection_frame_x + radius + bit, track_y + track_height)
        cr.arc (selection_frame_x + radius, track_y + track_height - radius, radius, 90 * degrees, 180.0 * degrees) 
        cr.arc (selection_frame_x + radius, track_y + radius, radius,  180.0 * degrees, 270.0 * degrees)
        cr.line_to(selection_frame_x + radius + bit, track_y)
    else:
        cr.move_to(selection_frame_x - radius - bit, track_y)
        cr.arc (selection_frame_x - radius, track_y + radius, radius,  -90.0 * degrees, 0.0 * degrees)
        cr.arc (selection_frame_x - radius, track_y + track_height - radius, radius, 0 * degrees, 90.0 * degrees)
        cr.line_to(selection_frame_x - radius - bit, track_y + track_height)
    cr.stroke()

    if editorpersistance.prefs.delta_overlay == True:
        delta = data["selected_frame"] - data["edit_frame"]        
        tc_str = utils.get_tc_string_short(abs(delta))
        tc_str = _get_signed_tc_str(tc_str, delta)
            
        _draw_text_info_box(cr, selection_frame_x + 3, track_y - 12, tc_str)

    _draw_kb_trim_indicator(cr, selection_frame_x, track_y)
    _draw_snap(cr, track_y)
    
def draw_one_roll_overlay_ripple(cr, data):
    # Trim overlay
    draw_one_roll_overlay(cr, data)
    
    # Blanks indicators
    ripple_data = data["ripple_data"]
    
    cr.set_line_width(2.0)
    cr.set_source_rgb(*OVERLAY_COLOR)
    
    for i in range(1, len(current_sequence().tracks) - 1):
        offset = ripple_data.track_blank_end_offset[i-1]
        if offset == None:
            continue
        
        delta = data["selected_frame"] - data["edit_frame"]
        if data["to_side_being_edited"]:
            indicator_frame = data["edit_frame"] - delta + offset
        else:
            indicator_frame = data["selected_frame"] + offset
        
        # Trimmed track needs different position
        if i == data["track"]:
            indicator_frame = data["edit_frame"] + delta + offset
            
        indicator_x = _get_frame_x(indicator_frame)
        
        track_height = current_sequence().tracks[i].height
        track_y = _get_track_y(i)

        # Max edit hint len on edit track
        if i == data["track"]:
            
            if data["to_side_being_edited"] == False:
                max_edit_frame = data["trim_limits"]["both_start"] 
            else:
                max_edit_frame = data["trim_limits"]["both_end"] 
        
            max_x = _get_frame_x(max_edit_frame)
        
            cr.save()
            cr.move_to(max_x, track_y)
            cr.line_to(max_x, track_y + track_height)
            cr.set_dash(BOX_DASHES, 0) 
            cr.stroke()
            cr.restore() # to get rid of dashes
            continue
            
        # Red indicators
        max_trim = False
        if delta == ripple_data.max_backwards:# and ripple_data.track_edit_ops[i-1] == appconsts.MULTI_TRIM_REMOVE:
            max_trim = True
        elif data["to_side_being_edited"] == False and delta == -ripple_data.max_backwards:
            max_trim = True
            
        if max_trim and i != data["track"]:
            cr.set_source_rgb(*TRIM_MAX_RED)

            cr.move_to(indicator_x, track_y)
            cr.line_to(indicator_x, track_y + track_height)
            cr.stroke()
     
            draw_y = track_y + track_height / 2

            cr.move_to(indicator_x + 2, draw_y)
            cr.line_to(indicator_x + 2, draw_y - 5)
            cr.line_to(indicator_x + 7, draw_y)
            cr.line_to(indicator_x + 2, draw_y + 5)
            cr.close_path()
            cr.fill()
            
def draw_slide_overlay(cr, data):
    track_height = current_sequence().tracks[data["track"]].height
    track_y = _get_track_y(data["track"])
    trim_limits = data["trim_limits"]
    
    clip = data["clip"]
    clip_start_frame = trim_limits["clip_start"]
    clip_end_frame = clip_start_frame + clip.clip_out - clip.clip_in + 1 # +1 to draw after out frame
    clip_start_frame_x = _get_frame_x(clip_start_frame)
    clip_end_frame_x = _get_frame_x(clip_end_frame)

    cr.set_line_width(2.0)
    media_start = clip_start_frame - data["mouse_delta"] - clip.clip_in
    orig_media_start_frame_x = _get_frame_x(media_start)
    orig_media_end_frame_x = _get_frame_x(media_start + trim_limits["media_length"])
    _draw_trim_clip_overlay(cr, orig_media_start_frame_x, orig_media_end_frame_x, track_y, track_height, False, (0.65,0.65,0.65, 0.65))

    _draw_end_triangles(cr, orig_media_start_frame_x, track_y, track_height, 6)
    _draw_end_triangles(cr, orig_media_end_frame_x, track_y, track_height, -6)
          
    cr.set_line_width(2.0)
    cr.set_source_rgb(*OVERLAY_SELECTION_COLOR)
    orig_clip_start_frame_x = _get_frame_x(clip_start_frame - data["mouse_delta"])
    orig_clip_end_frame_x = _get_frame_x(clip_end_frame - data["mouse_delta"])
    _draw_trim_clip_overlay(cr, orig_clip_start_frame_x, orig_clip_end_frame_x, track_y, track_height, False, (1,1,1,0.3))
        
    cr.move_to(clip_start_frame_x - 0.5, track_y - 6.5)
    cr.line_to(clip_start_frame_x - 0.5, track_y + track_height + 6.5)
    cr.stroke()

    cr.move_to(clip_end_frame_x - 0.5, track_y - 6.5)
    cr.line_to(clip_end_frame_x - 0.5, track_y + track_height + 6.5)
    cr.stroke()

    radius = 5.0
    degrees = M_PI/ 180.0
    bit = 3
    if not trim_mode_in_non_active_state:
        cr.set_source_rgb(0.9, 0.9, 0.2)
    else:
        cr.set_source_rgb(0.2, 0.2, 0.2)
    cr.set_line_width(2.0)
    cr.move_to(clip_start_frame_x - radius - bit, track_y)
    cr.arc (clip_start_frame_x - radius, track_y + radius, radius,  -90.0 * degrees, 0.0 * degrees)
    cr.arc (clip_start_frame_x - radius, track_y + track_height - radius, radius, 0 * degrees, 90.0 * degrees)
    cr.line_to(clip_start_frame_x - radius - bit, track_y + track_height)
    cr.move_to(clip_end_frame_x + radius + bit, track_y + track_height)
    cr.arc (clip_end_frame_x + radius, track_y + track_height - radius, radius, 90 * degrees, 180.0 * degrees) 
    cr.arc (clip_end_frame_x + radius, track_y + radius, radius,  180.0 * degrees, 270.0 * degrees)
    cr.line_to(clip_end_frame_x + radius + bit, track_y)
    cr.stroke()

    if data["start_frame_being_viewed"]:
        x = clip_start_frame_x + 4
    else:
        x = clip_end_frame_x - 16

    cr.set_source_surface(VIEW_SIDE_ICON, x, track_y + 4)
    cr.paint()

    _draw_kb_trim_indicator(cr, x, track_y)

    if editorpersistance.prefs.delta_overlay == True:
        delta = data["mouse_delta"]  
        tc_str = utils.get_tc_string_short(abs(delta))
        tc_str = _get_signed_tc_str(tc_str, delta)
            
        _draw_text_info_box(cr, clip_start_frame_x + 3, track_y - 12, tc_str)
        
def draw_clip_end_drag_overlay(cr, data):
    if data["editing_clip_end"] == True:
        end = data["frame"]  - pos
        start = data["clip_start"]  - pos
    else:
        start = data["frame"]  - pos
        end = data["clip_end"]  - pos

    y = _get_track_y(data["track"].id)
    
    # Draw clips in draw range
    cr.set_line_width(MOVE_CLIPS_LINE_WIDTH)


    clip_length = end - start
    scale_length = clip_length * pix_per_frame
    scale_in = int(start * pix_per_frame) + 0.5
    track_height = data["track_height"]

    cr.rectangle(scale_in, int(y) + 1.5, int(scale_length), track_height - 2.0)
    cr.set_source_rgba(*CLIP_END_DRAG_OVERLAY_COLOR)
    cr.fill_preserve()
    if data["submode"] == 0: # INSERT 
        cr.set_source_rgb(*OVERLAY_TRIM_COLOR)
    else:
        cr.set_source_rgb(*OVERLAY_TRIM_OVERWRITE_COLOR)
    cr.stroke()

    if editorpersistance.prefs.delta_overlay == True:
        if data["editing_clip_end"] == True:
            x = scale_in + scale_length
            delta = data["frame"] - data["orig_out"]
        else:
            x = scale_in
            delta = data["frame"] - data["orig_in"]  - 1
            
        tc_str = utils.get_tc_string_short(abs(delta))
        tc_str = _get_signed_tc_str(tc_str, delta)

        _draw_text_info_box(cr, x - 3, y - 12, tc_str)
    
    _draw_snap(cr, y)
            
def draw_compositor_move_overlay(cr, data):
    # Get data
    press_frame = data["press_frame"]
    current_frame = data["current_frame"]
    clip_in = data["clip_in"]
    clip_length = data["clip_length"]
    y = data["compositor_y"]
    compositor = data["compositor"]
    
    draw_start = clip_in + (current_frame - press_frame)
    clip_start_frame = draw_start - pos
    scale_length = clip_length * pix_per_frame
    scale_in = clip_start_frame * pix_per_frame

    target_track = current_sequence().tracks[compositor.transition.a_track]
    target_y = _get_track_y(target_track.id) + target_track.height - COMPOSITOR_HEIGHT_OFF
            
    _create_compositor_cairo_path(cr, scale_in, scale_length, y, target_y)
            
    cr.set_line_width(2.0)
    cr.set_source_rgb(*OVERLAY_COLOR)
    cr.stroke()

    if editorpersistance.prefs.delta_overlay == True:
        delta = current_frame - press_frame
        tc_str = utils.get_tc_string_short(abs(delta))
        tc_str = _get_signed_tc_str(tc_str, delta)
            
        _draw_text_info_box(cr, scale_in, y - 12, tc_str)
    
    _draw_snap(cr, y)

def draw_cut_overlay(cr, data):
    pass

def draw_kftool_overlay(cr, data):
    # This is bit different because editing happens on overlay, which needs to much more complex and code part of tool module.
    if data == None:
        return
    draw_function = data["draw_function"] # this is kftoolmode._tline_overlay(cr)
    draw_function(cr)
    
def draw_compositor_trim(cr, data):
    clip_in = data["clip_in"]
    clip_out = data["clip_out"]
    y = data["compositor_y"]
    compositor = data["compositor"]

    clip_start_frame = clip_in - pos
    clip_length = clip_out - clip_in + 1
    scale_length = clip_length * pix_per_frame
    scale_in = clip_start_frame * pix_per_frame

    target_track =  current_sequence().tracks[compositor.transition.a_track]
    target_y = _get_track_y(target_track.id) + target_track.height - COMPOSITOR_HEIGHT_OFF
            
    _create_compositor_cairo_path(cr, scale_in, scale_length, y, target_y)
    
    cr.set_line_width(2.0)
    cr.set_source_rgb(*OVERLAY_TRIM_COLOR)
    cr.stroke()
    
    if data["trim_is_clip_in"] == True:
        x = scale_in + 2
        delta = data["clip_in"] - data["orig_clip_in"]
        info_x = scale_in - 3
    else:
        x = scale_in + scale_length - 26
        delta = data["clip_out"] - data["orig_clip_out"]
        info_x = scale_in + + scale_length - 3

    _draw_two_arrows(cr, x, y + 4, 4)

    if editorpersistance.prefs.delta_overlay == True:
        tc_str = utils.get_tc_string_short(abs(delta))
        tc_str = _get_signed_tc_str(tc_str, delta)
            
        _draw_text_info_box(cr, info_x, y - 12, tc_str)

    _draw_snap(cr, y)
    
def _create_compositor_cairo_path(cr, scale_in, scale_length, y, target_y):
    scale_in = int(scale_in) + 0.5
    scale_length = int(scale_length)
    y = int(y) + 0.5
    cr.move_to(scale_in + 0.5, y + 0.5)
    cr.line_to(scale_in + 0.5 + scale_length, y + 0.5)
    cr.line_to(scale_in + 0.5 + scale_length, y + 0.5 + COMPOSITOR_HEIGHT)
    cr.line_to(scale_in + 0.5 + COMPOSITOR_TRACK_X_PAD + 2 * COMPOSITOR_TRACK_ARROW_WIDTH, y + 0.5 + COMPOSITOR_HEIGHT)
    cr.line_to(scale_in + 0.5 + COMPOSITOR_TRACK_X_PAD + 2 * COMPOSITOR_TRACK_ARROW_WIDTH, target_y + 0.5 - COMPOSITOR_TRACK_ARROW_HEAD_WIDTH_HEIGHT)
    cr.line_to(scale_in + 0.5 + COMPOSITOR_TRACK_X_PAD + COMPOSITOR_TRACK_ARROW_WIDTH + COMPOSITOR_TRACK_ARROW_HEAD_WIDTH, target_y + 0.5 - COMPOSITOR_TRACK_ARROW_HEAD_WIDTH_HEIGHT)
    cr.line_to(scale_in + 0.5 + COMPOSITOR_TRACK_X_PAD + COMPOSITOR_TRACK_ARROW_WIDTH, target_y + 0.5)
    cr.line_to(scale_in + 0.5 + COMPOSITOR_TRACK_X_PAD + COMPOSITOR_TRACK_ARROW_WIDTH - COMPOSITOR_TRACK_ARROW_HEAD_WIDTH, target_y + 0.5 - COMPOSITOR_TRACK_ARROW_HEAD_WIDTH_HEIGHT)
    cr.line_to(scale_in + 0.5 + COMPOSITOR_TRACK_X_PAD, target_y + 0.5 - COMPOSITOR_TRACK_ARROW_HEAD_WIDTH_HEIGHT)
    cr.line_to(scale_in + 0.5 + COMPOSITOR_TRACK_X_PAD, y + 0.5 + COMPOSITOR_HEIGHT)
    cr.line_to(scale_in + 0.5, y + 0.5 + COMPOSITOR_HEIGHT)
    cr.close_path()

def _draw_two_arrows(cr, x, y, distance):
    """
    Draws two arrows indicating that user can drag in 
    both directions in a trim mode
    """
    cr.set_source_rgb(*OVERLAY_COLOR)
    cr.move_to(x + 10, y)
    cr.line_to(x + 10, y + 10)
    cr.line_to(x, y + 5)
    cr.close_path()
    cr.fill()

    cr.move_to(x + 10 + distance, y)
    cr.line_to(x + 10 + distance, y + 10)
    cr.line_to(x + 20 + distance, y + 5)
    cr.close_path()
    cr.fill()

def _draw_selected_frame(cr, x, y, track_height):
    cr.set_source_rgb(*OVERLAY_SELECTION_COLOR)
    cr.move_to(x - 0.5, y - 3.5)
    cr.line_to(x - 0.5, y + track_height + 3.5)
    cr.stroke()

def _draw_mode_arrow(cr, x, y, color):
    cr.move_to(x - 3.5, y - 3.5)
    cr.line_to(x + 3.5, y - 3.5)
    cr.line_to(x + 3.5, y + 8.5)
    cr.line_to(x + 5.5, y + 8.5)
    cr.line_to(x, y + 12.5)
    cr.line_to(x - 5.5, y + 8.5)
    cr.line_to(x - 3.5, y + 8.5)
    cr.close_path()
    cr.set_source_rgb(*color)
    cr.fill_preserve()
    cr.set_source_rgb(0, 0, 0)
    cr.set_line_width(2.0)
    cr.stroke()

def _draw_end_triangles(cr, x, y, h, direction):
    triangles = 4
    if h < appconsts.TRACK_HEIGHT_NORMAL:
        triangles = 2
    cr.set_source_rgb(1, 1, 1)
    for i in range(0, triangles):
        cr.move_to(x, y + 2.5)
        cr.line_to(x + direction, y + 7.0)
        cr.line_to(x, y + 11.5)
        cr.close_path()
        cr.fill()
        y = y + 12.0

def _draw_trim_clip_overlay(cr, start_x, end_x, y, track_height, draw_stroke, color=(1,1,1,1)):
    cr.set_source_rgba(*color)
    cr.rectangle(start_x, y, end_x - start_x, track_height)
    if draw_stroke:
        cr.stroke()
    else:
        cr.fill()

def _draw_overwrite_clips_overlay(cr, start_x, end_x, y, track_height):
    cr.set_source_rgba(*OVERWRITE_OVERLAY_COLOR)
    cr.rectangle(start_x, y, end_x - start_x, track_height)
    cr.fill()

def _draw_view_icon(cr, x, y):
    cr.set_source_surface(VIEW_SIDE_ICON, x, y)
    cr.paint()

def _draw_snap(cr, y):
    if snapping.snap_active() == True:
        cr.set_source_surface(SNAP_ICON, int(snapping.get_snap_x()) - 6, int(y) - 14)
        cr.paint()

def _draw_kb_trim_indicator(cr, x, y):
    if databridge.trimmodes_submode_is_keyb_edit_on() == True: 
        cr.set_source_surface(KEYBOARD_ICON, int(x) - 9, int(y) - 16)
        cr.paint()

def _draw_text_info_box(cr, x, y, text):
    x = int(x)
    y = int(y)
    cr.set_source_rgb(1, 1, 1)
    cr.select_font_face ("sans-serif",
                     cairo.FONT_SLANT_NORMAL,
                     cairo.FONT_WEIGHT_NORMAL)
    cr.set_font_size(13)

    x_bearing, y_bearing, width, height, x_advance, y_advance = cr.text_extents(text)
    
    x1 = x - 3.5
    y1 = y + 4.5
    x2 = x + width + 5.5
    y2 = y - height - 4.5
    
    cr.move_to(x1, y1)
    cr.line_to(x1, y2)
    cr.line_to(x2, y2)
    cr.line_to(x2, y1)
    cr.close_path()
    cr.set_source_rgb(0.1, 0.1, 0.1)
    cr.fill_preserve()
    
    cr.set_line_width(1.0)
    cr.set_source_rgb(0.7, 0.7, 0.7)
    cr.stroke()
    
    cr.move_to(x, y)
    cr.set_source_rgb(0.8, 0.8, 0.8)
    cr.show_text(text) 

def _get_signed_tc_str(tc_str, delta):
    if delta < 0:
        tc_str = "-" + tc_str
    elif  delta > 0:
        tc_str = "+" + tc_str
    return tc_str


# ------------------------------- WIDGETS
class TimeLineCanvas:
    """
    GUI component for editing clips.
    """

    def __init__(self, press_listener, move_listener, release_listener, double_click_listener,
                    mouse_scroll_listener, leave_notify_listener, enter_notify_listener):
        # Create widget and connect listeners
        self.widget = cairoarea.CairoDrawableArea2( MINIMUM_WIDTH, 
                                                    HEIGHT, 
                                                    self._draw)
        self.widget.add_pointer_motion_mask()
        
        self.widget.press_func = self._press_event
        self.widget.motion_notify_func = self._motion_notify_event
        self.widget.release_func = self._release_event
        self.widget.mouse_scroll_func = mouse_scroll_listener

        # Mouse events are passed on 
        self.press_listener = press_listener
        self.move_listener = move_listener
        self.release_listener = release_listener
        self.double_click_listener = double_click_listener

        self.widget.leave_notify_func = leave_notify_listener
        self.widget.enter_notify_func = enter_notify_listener

        self.mouse_scroll_listener = mouse_scroll_listener
        self.leave_notify_listener = leave_notify_listener
        self.enter_notify_listener = enter_notify_listener
        
        # Edit mode
        self.edit_mode_data = None
        self.edit_mode_overlay_draw_func = draw_insert_overlay
        
        # Drag state
        self.drag_on = False
                
        # for edit mode setting
        global canvas_widget
        canvas_widget = self
        
    #---------------------------- MOUSE EVENTS
    def _press_event(self, event):
        """
        Mouse button callback
        """
        if event.n_press == 2:
            self.double_click_listener(get_frame(event.x), event.x, event.y)
            return
         
        self.drag_on = True
        self.press_listener(event, get_frame(event.x))

    def _motion_notify_event(self, x, y, state):
        """
        Mouse move callback
        """
        # No edit is going on and cursor is on timeline, we need to do context
        # sensitive cursor updates.
        if (not self.drag_on) and editorstate.cursor_is_tline_sensitive == True:
            global zoom_mouse_x
            zoom_mouse_x = x

            self.set_pointer_context(x, y)
            return

        button = -1 
        if (state & Gdk.ModifierType.BUTTON1_MASK):
            button = 1
        elif (state & Gdk.ModifierType.BUTTON3_MASK):
            button = 3
        
        track = get_track(y)
        x = snapping.get_snapped_x(x, track, self.edit_mode_data)
            
        self.move_listener(x, y, get_frame(x), button, state) # -> editevent.tline_canvas_mouse_moved(...)
        
    def _release_event(self, event):
        """
        Mouse release callback.
        """
        self.drag_on = False
        
        track = get_track(event.y)
        x = snapping.get_snapped_x(event.x, track, self.edit_mode_data)
        snapping.mouse_edit_ended()
        
        self.release_listener(x, event.y, get_frame(x), \
                              event.button, event.get_state())

    def set_pointer_context(self, x, y):
        current_pointer_context = self.get_pointer_context(x, y)

        # If pointer_context changed then save it and change cursor.
        global pointer_context
        if pointer_context != current_pointer_context:
            pointer_context = current_pointer_context
            if pointer_context == appconsts.POINTER_CONTEXT_NONE:
                gui.editor_window.tline_cursor_manager.set_tline_cursor(EDIT_MODE())
            else:
                gui.editor_window.tline_cursor_manager.set_tline_cursor_to_context(pointer_context)
        
    def get_pointer_context(self, x, y):
        frame = get_frame(x)
        hit_compositor = compositor_hit(frame, x, y, current_sequence().compositors)
        if hit_compositor != None:
            return callbackbridge.compositormodes_get_pointer_context(hit_compositor, x)

        track = get_track(y)
        if track == None:
            return appconsts.POINTER_CONTEXT_NONE

        clip_index = current_sequence().get_clip_index(track, frame)
        if clip_index == -1: # frame after last clip on track
            return appconsts.POINTER_CONTEXT_NONE

        try:
            clip = track.clips[clip_index]
        except:
            return  appconsts.POINTER_CONTEXT_NONE # We probably should not hit this

        clip_start_frame = track.clip_start(clip_index)
        clip_end_frame = track.clip_start(clip_index + 1)
        
        # INSERT, OVERWRITE
        if (EDIT_MODE() == editorstate.INSERT_MOVE or EDIT_MODE() == editorstate.OVERWRITE_MOVE) and editorstate.overwrite_mode_box == False:
            if not(editorpersistance.prefs.disable_drag_when_selected == True and clip.selected == True):
                # the + 4 is attempt to center sensitivity area at cut. Because we are doing sensitivity testing on opposite sides of a single clip, not on
                # both sides of a cut we are having trouble centering the sensitivity area. 
                if abs(x - _get_frame_x(clip_start_frame)) < DRAG_SENSITIVITY_AREA_WIDTH_PIX + 4:
                    return appconsts.POINTER_CONTEXT_END_DRAG_LEFT
                if abs(x + 4 - _get_frame_x(clip_end_frame)) < DRAG_SENSITIVITY_AREA_WIDTH_PIX:
                    return appconsts.POINTER_CONTEXT_END_DRAG_RIGHT
            
            return appconsts.POINTER_CONTEXT_NONE
        # TRIM
        elif EDIT_MODE() == editorstate.ONE_ROLL_TRIM or EDIT_MODE() == editorstate.ONE_ROLL_TRIM_NO_EDIT:
            if abs(frame - clip_start_frame) < abs(frame - clip_end_frame):
                if clip.is_blanck_clip == True:
                     return appconsts.POINTER_CONTEXT_NONE
                return appconsts.POINTER_CONTEXT_TRIM_LEFT
            else:
                if clip.is_blanck_clip == True:
                     return appconsts.POINTER_CONTEXT_NONE
                return appconsts.POINTER_CONTEXT_TRIM_RIGHT
        # BOX
        elif (EDIT_MODE() == editorstate.OVERWRITE_MOVE and editorstate.overwrite_mode_box == True and 
            callbackbridge.boxmove_get_selection_data() != None):

            if callbackbridge.boxmove_get_selection_data().is_hit(x, y):
                return appconsts.POINTER_CONTEXT_BOX_SIDEWAYS
        # MULTI TRIM
        elif EDIT_MODE() == editorstate.MULTI_TRIM:
            editorstate.set_mouse_current_non_drag_pos(x, y)
            clip_start_frame_x = _get_frame_x(clip_start_frame)
            clip_end_frame_x = _get_frame_x(clip_end_frame)
            clip_center_x = (clip_end_frame_x - clip_start_frame_x) / 2 + clip_start_frame_x
            if abs(x - clip_start_frame_x) < MULTI_TRIM_ROLL_SENSITIVITY_AREA_WIDTH_PIX + 4: # +4, somehow we were getting non-symmetrical areas of sensitivity on different sides of cut, so this was added as quick'n'dirty fix without finding out the root cause.
                return appconsts.POINTER_CONTEXT_MULTI_ROLL
            elif abs(x - clip_end_frame_x) < MULTI_TRIM_ROLL_SENSITIVITY_AREA_WIDTH_PIX:
                return appconsts.POINTER_CONTEXT_MULTI_ROLL
            
            if editorpersistance.prefs.wide_multitrim_slip == False:
                if abs(x - clip_center_x) < MULTI_TRIM_SLIP_SENSITIVITY_AREA_WIDTH_PIX:
                    if clip.is_blanck_clip == True:
                         return appconsts.POINTER_CONTEXT_NONE
                    return appconsts.POINTER_CONTEXT_MULTI_SLIP
                elif abs(frame - clip_start_frame) < abs(frame - clip_end_frame):
                    if clip.is_blanck_clip == True:
                         return appconsts.POINTER_CONTEXT_NONE
                    return appconsts.POINTER_CONTEXT_TRIM_LEFT
                else:
                    if clip.is_blanck_clip == True:
                         return appconsts.POINTER_CONTEXT_NONE
                    return appconsts.POINTER_CONTEXT_TRIM_RIGHT
            else:
                # Wide slip trim activation area.                        
                if abs(x - clip_start_frame_x) < MULTI_TRIM_ENDS_SENSITIVITY_AREA_WIDTH_PIX:
                    if clip.is_blanck_clip == True:
                         return appconsts.POINTER_CONTEXT_NONE
                    return appconsts.POINTER_CONTEXT_TRIM_LEFT
                elif abs(x - clip_end_frame_x) < MULTI_TRIM_ENDS_SENSITIVITY_AREA_WIDTH_PIX:
                    if clip.is_blanck_clip == True:
                         return appconsts.POINTER_CONTEXT_NONE
                    return appconsts.POINTER_CONTEXT_TRIM_RIGHT
                else:
                    if clip.is_blanck_clip == True:
                         return appconsts.POINTER_CONTEXT_NONE
                    return appconsts.POINTER_CONTEXT_MULTI_SLIP

        return appconsts.POINTER_CONTEXT_NONE

    def connect_mouse_events(self):
        self.widget.press_func = self._press_event
        self.widget.motion_notify_func = self._motion_notify_event
        self.widget.release_func = self._release_event

        self.widget.mouse_scroll_func = self.mouse_scroll_listener
        self.widget.leave_notify_func = self.leave_notify_listener
        self.widget.enter_notify_func = self.enter_notify_listener
        
    def disconnect_mouse_events(self):
        self.widget.press_func = self.widget._press
        self.widget.motion_notify_func = self.widget._motion_notify
        self.widget.release_func = self.widget._release

        self.widget.mouse_scroll_func = None
        self.widget.leave_notify_func = self.widget._leave
        self.widget.enter_notify_func = self.widget._enter
        
    #----------------------------------------- DRAW
    def _draw(self, event, cr, allocation):
        x, y, w, h = allocation

        # Draw bg
        cr.set_source_rgb(*BG_COLOR)
        cr.rectangle(0, 0, w, h)
        cr.fill()

        # This can get called during loads by unwanted expose events
        if editorstate.project_is_loading == True:
            return

        # Init sync draw structures
        self.parent_positions = {}
        self.sync_children = []

        # Draw track lines, light.
        for i in range(0, len(current_sequence().tracks) - 1):
            y = int(_get_track_y(i))
            cr.set_source_rgb(0.165, 0.165, 0.165)
            cr.set_line_width(1.0)
            cr.move_to(0, y + 0.5)
            cr.line_to(w, y + 0.5)
            cr.stroke()
        
        # Draw tracks
        for i in range(1, len(current_sequence().tracks) - 1): # black and hidden tracks are ignored
            self.draw_track(cr,
                            current_sequence().tracks[i],
                            _get_track_y(i),
                            w)

        self.draw_compositors(cr)
        self.draw_sync_relations(cr)

        # Exit displaying from fake_current_pointer for SLIDE_TRIM mode if last displayed 
        # was from fake_pointer but this is not anymore
        global fake_current_frame
        if EDIT_MODE() != editorstate.SLIDE_TRIM and fake_current_frame != None:
            PLAYER().seek_frame(fake_current_frame)
            fake_current_frame = None
            
        # Draw frame pointer
        if EDIT_MODE() != editorstate.SLIDE_TRIM or PLAYER().looping():
            current_frame = PLAYER().tracktor_producer.frame()
        else:
            current_frame = fake_current_frame

        if timeline_visible():
            pointer_frame = current_frame
            cr.set_source_rgb(0, 0, 0)
        else:
            pointer_frame = editorstate.tline_shadow_frame
            cr.set_source_rgb(*SHADOW_POINTER_COLOR)
        disp_frame = pointer_frame - pos
        frame_x = math.floor(disp_frame * pix_per_frame) + 0.5
        cr.move_to(frame_x, 0)
        cr.line_to(frame_x, h)
        cr.set_line_width(1.0)
        cr.stroke()

        # Draw edit mode overlay
        if self.edit_mode_overlay_draw_func != None:
            self.edit_mode_overlay_draw_func(cr, self.edit_mode_data)
        
        audiowaveformrenderer.launch_queued_renders()

    def draw_track(self, cr, track, y, width):
        """
        Draws visible clips in track.
        """
        # Get text pos for track height
        track_height = track.height
        if track_height == appconsts.TRACK_HEIGHT_HIGH: 
            text_y = TEXT_Y_HIGH
        elif track_height == appconsts.TRACK_HEIGHT_NORMAL:
            text_y = TEXT_Y
        elif track_height == appconsts.TRACK_HEIGHT_SMALL:
            text_y = TEXT_Y_SMALL

        # Get clip indexes for clips overlapping first and last displayed frame.
        start = track.get_clip_index_at(int(pos))
        end = track.get_clip_index_at(int(pos + width / pix_per_frame))

        width_frames = float(width) / pix_per_frame

        # Add 1 to end because range() last index exclusive 
        # MLT returns clips structure size + 1 if frame after last clip,
        # so in that case don't add anything.
        if len(track.clips) != end:
            end = end + 1
            
        # Get frame of clip.clip_in on timeline.
        clip_start_in_tline = track.clip_start(start)

        # Pos is the first drawn frame.
        # clip_start_frame starts always less or equal to zero as this is
        # the first maybe partially displayed clip.
        clip_start_frame = clip_start_in_tline - pos

        proxy_paths = current_proxy_media_paths()

        global clip_thumbnails
                
        # Draw clips in draw range
        for i in range(start, end):

            clip = track.clips[i]

            # Get clip frame values
            clip_in = clip.clip_in
            clip_out = clip.clip_out
            clip_length = clip_out - clip_in + 1 # +1 because in and out both inclusive
            scale_length = clip_length * pix_per_frame
            scale_in = clip_start_frame * pix_per_frame
            
            # Collect positions for drawing sync relations 
            #if collect_positions:
            self.parent_positions[clip.id] = (scale_in, track.id)
            
            # Fill clip bg 
            if scale_length > FILL_MIN:
                # Select color
                clip_bg_col = None
                if clip.color != None:
                    r,g,b = clip.color
                    grad_col1 = (1, r, g, b, 1.0)
                    grad_col2 = get_multiplied_grad(0, 1, grad_col1, GRAD_MULTIPLIER)
                    if clip.selected:
                         grad_col1 = get_multiplied_grad(1, 1, grad_col1, 1.2)
                         grad_col2 = get_multiplied_grad(0, 1, grad_col2, 1.2)
                    grad = cairo.LinearGradient (0, y, 0, y + track_height)
                    grad.add_color_stop_rgba(*grad_col1)
                    grad.add_color_stop_rgba(*grad_col2)
                    cr.set_source(grad)
                    clip_bg_col = clip.color
                elif clip.is_blanck_clip:
                    if clip.selected:
                        grad = cairo.LinearGradient (0, y, 0, y + track_height)
                        grad.add_color_stop_rgba(*BLANK_CLIP_COLOR_SELECTED_GRAD)
                        grad.add_color_stop_rgba(*BLANK_CLIP_COLOR_SELECTED_GRAD_L)
                        cr.set_source(grad)
                    else:
                        grad = cairo.LinearGradient (0, y, 0, y + track_height)
                        grad.add_color_stop_rgba(*BLANK_CLIP_COLOR_GRAD)
                        grad.add_color_stop_rgba(*BLANK_CLIP_COLOR_GRAD_L)
                        cr.set_source(grad)
                elif track.type == appconsts.VIDEO:
                    if clip.container_data != None:
                        # Container clip
                        if clip.container_data.rendered_media_range_in == -1 \
                            or (hasattr(clip.container_data, "progress") and clip.container_data.progress != None):
                            if not clip.selected:
                                clip_bg_col = (0.7, 0.3, 0.3)
                                cr.set_source_rgb(*CONTAINER_CLIP_NOT_RENDERED_COLOR)
                                clip_bg_col = CONTAINER_CLIP_NOT_RENDERED_COLOR
                            else:
                                cr.set_source_rgb(*CONTAINER_CLIP_NOT_RENDERED_SELECTED_COLOR)
                                clip_bg_col = CONTAINER_CLIP_NOT_RENDERED_SELECTED_COLOR
                        else:
                            if not clip.selected:
                                clip_bg_col = (0.7, 0.3, 0.3)
                                cr.set_source_rgb(*CONTAINER_CLIP_RENDERED_COLOR)
                                clip_bg_col = CONTAINER_CLIP_RENDERED_COLOR
                            else:
                                cr.set_source_rgb(*CONTAINER_CLIP_RENDERED_SELECTED_COLOR)
                                clip_bg_col = CONTAINER_CLIP_RENDERED_SELECTED_COLOR
                    elif clip.media_type == appconsts.VIDEO:
                        # Video clip
                        if not clip.selected:
                            grad = cairo.LinearGradient (0, y, 0, y + track_height)
                            grad.add_color_stop_rgba(*CLIP_COLOR_GRAD)
                            grad.add_color_stop_rgba(*CLIP_COLOR_GRAD_L)
                            clip_bg_col = CLIP_COLOR_GRAD[1:4]
                            cr.set_source(grad)
                        else:
                            cr.set_source_rgb(*CLIP_SELECTED_COLOR)
                            clip_bg_col = CLIP_SELECTED_COLOR
                    else: # Image type
                        if clip.titler_data == None:
                            if not clip.selected:
                                grad = cairo.LinearGradient (0, y, 0, y + track_height)
                                grad.add_color_stop_rgba(*IMAGE_CLIP_COLOR_GRAD)
                                grad.add_color_stop_rgba(*IMAGE_CLIP_COLOR_GRAD_L)
                                clip_bg_col = IMAGE_CLIP_COLOR_GRAD[1:4]
                                cr.set_source(grad)
                            else:
                                cr.set_source_rgb(*IMAGE_CLIP_SELECTED_COLOR)
                                clip_bg_col = IMAGE_CLIP_SELECTED_COLOR
                        else:
                            # Titler clip
                            if not clip.selected:
                                grad = cairo.LinearGradient (0, y, 0, y + track_height)
                                grad.add_color_stop_rgba(*TITLE_IMAGE_CLIP_COLOR_GRAD)
                                grad.add_color_stop_rgba(*TITLE_IMAGE_CLIP_COLOR_GRAD_L)
                                clip_bg_col = TITLE_IMAGE_CLIP_COLOR_GRAD[1:4]
                                cr.set_source(grad)
                            else:
                                cr.set_source_rgb(*TITLE_IMAGE_CLIP_SELECTED_COLOR)
                                clip_bg_col = TITLE_IMAGE_CLIP_SELECTED_COLOR
                else:# Audio track
                    if not clip.selected:
                        grad = cairo.LinearGradient (0, y, 0, y + track_height)
                        grad.add_color_stop_rgba(*AUDIO_CLIP_COLOR_GRAD)
                        grad.add_color_stop_rgba(*AUDIO_CLIP_COLOR_GRAD_L)
                        clip_bg_col = AUDIO_CLIP_COLOR_GRAD[1:4]
                        cr.set_source(grad)
                    else:
                        clip_bg_col = AUDIO_CLIP_SELECTED_COLOR
                        cr.set_source_rgb(*AUDIO_CLIP_SELECTED_COLOR)
                
                # Clip bg
                self.create_round_rect_path(cr, scale_in, y, scale_length, track_height)
                cr.fill()

            # Draw transition clip image 
            if ((scale_length > FILL_MIN) and hasattr(clip, "rendered_type")):
                if not clip.selected:
                    cr.set_source_rgb(1.0, 1.0, 1.0)
                else:
                    cr.set_source_rgb(*SINGLE_TRACK_TRANSITION_SELECTED)

                cr.rectangle(scale_in + 2.5,
                         y + 2.5, scale_length - 4.0, 
                         track_height - 4.0)
                cr.fill()

                right = scale_in + 2.5 + scale_length - 6.0
                right_half = scale_in + 2.5 + ((scale_length - 6.0) / 2.0)
                down = y + 2.5 + track_height - 6.0
                down_half = y + 2.5 + ((track_height - 6.0) / 2.0)
                cr.set_source_rgb(0, 0, 0)
                
                if clip.rendered_type == appconsts.RENDERED_DISSOLVE:
                    cr.move_to(right, y + 4.5)
                    cr.line_to(right, down)
                    cr.line_to(scale_in + 4.5, down)
                    cr.close_path()
                    cr.fill()
                elif clip.rendered_type == appconsts.RENDERED_WIPE:
                    cr.rectangle(scale_in + 2.0, y + 2.0, scale_length - 4.0, track_height - 4.0)
                    cr.fill()
                    if not clip.selected:
                        cr.set_source_rgb(1.0, 1.0, 1.0)
                    else:
                        cr.set_source_rgb(*SINGLE_TRACK_TRANSITION_SELECTED)
                    cr.move_to(right_half, y + 3.0 + 2.0)
                    cr.line_to(right - 2.0, down_half)
                    cr.line_to(right_half, down - 2.0)
                    cr.line_to(scale_in + 2.0 + 4.0, down_half)
                    cr.close_path()
                    cr.fill()
                elif clip.rendered_type == appconsts.RENDERED_COLOR_DIP:
                    cr.move_to(scale_in + 4.5, y + 4.5)
                    cr.line_to(right, y + 4.5)
                    cr.line_to(right_half, down)
                    cr.close_path()
                    cr.fill()       
                elif clip.rendered_type == appconsts.RENDERED_FADE_IN:
                    cr.move_to(scale_in + 4.5, y + 4.5)
                    cr.line_to(right, y + 4.5)
                    cr.line_to(scale_in + 4.5, down_half)
                    cr.close_path()
                    cr.fill()
                    cr.move_to(scale_in + 4.5, down_half)
                    cr.line_to(right, down)
                    cr.line_to(scale_in + 4.5, down)
                    cr.close_path()
                    cr.fill()
                else: # clip.rendered_type == appconsts.RENDERED_FADE_OUT:
                    cr.move_to(scale_in + 4.5, y + 4.5)
                    cr.line_to(right, y + 4.5)
                    cr.line_to(right, down_half)
                    cr.close_path()
                    cr.fill()
                    cr.move_to(right, down_half)
                    cr.line_to(right, down)
                    cr.line_to(scale_in + 4.5, down)
                    cr.close_path()
                    cr.fill()

            # Draw video clip icon.
            text_x_add = 0
            if scale_length > TEXT_MIN and editorstate.display_clip_media_thumbnails:
                if clip.is_blanck_clip == False and track.type == appconsts.VIDEO and \
                    (clip.media_type == appconsts.VIDEO or clip.media_type == appconsts.IMAGE 
                        or clip.media_type == appconsts.IMAGE_SEQUENCE):
                        
                    text_x_add = 115
                    cr.save()
                    try: # paint thumbnail
                        thumb_img = clip_thumbnails[clip.path]
                        self.create_round_rect_path(cr, scale_in + 5, y + 4.5, scale_length - 10, track_height - 8, 3.0)
                        cr.clip()
                        cr.set_source_surface(thumb_img,scale_in, y - 20)
                        cr.paint()
                    except: # thumbnail not found  in dict, get it and  paint it.
                        try:
                            if clip.container_data == None:
                                if clip.slowmo_data == None:
                                    # normal clip
                                    media_file = PROJECT().get_media_file_for_path(clip.path)
                                    thumb_img = media_file.icon
                                else:
                                    # slowmo clip
                                    slowmo_type, orig_media_file_path, \
                                    slowmo_clip_media_area, slowmo_speed_data,\
                                    orig_media_in, orig_media_out = clip.slowmo_data
                                    media_file = PROJECT().get_media_file_for_path(orig_media_file_path)
                                    if media_file != None:
                                        thumb_img = media_file.icon
                                    else:
                                        # Original media file not present and we don't want to start rendering, 
                                        # so we'll just use a default slowmo icon.
                                        icon = cairo.ImageSurface.create_from_png(respaths.IMAGE_PATH + "slowmo.png")
                                        scaled_icon = cairo.ImageSurface(cairo.FORMAT_ARGB32, appconsts.THUMB_WIDTH, appconsts.THUMB_HEIGHT)
                                        cr2 = cairo.Context(scaled_icon)
                                        cr2.scale(float(appconsts.THUMB_WIDTH) / float(icon.get_width()), float(appconsts.THUMB_HEIGHT) / float(icon.get_height()))
                                        cr2.set_source_surface(icon, 0, 0)
                                        cr2.paint()
                                        thumb_img = scaled_icon
                                                
                            else:
                                media_file = PROJECT().get_media_file_for_path(clip.path)
                                if media_file != None:
                                    thumb_img = media_file.icon
                                else:
                                    thumb_img = clip.container_data.get_rendered_thumbnail()

                            cr.rectangle(scale_in + 4, y + 3.5, scale_length - 8, track_height - 6)
                            cr.clip()
                            cr.set_source_surface(thumb_img, scale_in, y - 20)
                            cr.paint()
                            clip_thumbnails[clip.path] = thumb_img
                        except:
                            pass # This fails for rendered fades and transitions.
                    
                    if clip.selected:
                        if scale_length - 8 < appconsts.THUMB_WIDTH:
                            ow = scale_length - 8 
                        else:
                            ow = appconsts.THUMB_WIDTH
                        cr.rectangle(scale_in + 4, y + 3.5, ow, track_height - 6)
                        cr.set_source_rgba(*ICON_SELECTED_OVERLAY_COLOR)
                        cr.fill()
                                                    
                    cr.restore()

            # Draw audio levels data if needed.
            # Init data rendering if data needed and not available.
            if clip.is_blanck_clip == False and clip.waveform_data == None and editorstate.display_all_audio_levels == True \
                and clip.media_type != appconsts.IMAGE and clip.media_type != appconsts.IMAGE_SEQUENCE and clip.media_type != appconsts.PATTERN_PRODUCER:
                clip.waveform_data = audiowaveformrenderer.get_waveform_data(clip)
            # Draw data if available large enough scale
            if clip.is_blanck_clip == False and clip.waveform_data != None and scale_length > FILL_MIN and editorstate.display_all_audio_levels == True:
                r, g, b = clip_bg_col
                cr.set_source_rgb(r * 1.9, g * 1.9, b * 1.9)
                
                cr.save()
                self.create_round_rect_path(cr, scale_in,
                                             y, scale_length - 1, 
                                             track_height)
                cr.clip()
                                         
                if track.height == appconsts.TRACK_HEIGHT_HIGH:
                    y_pad = WAVEFORM_PAD_HIGH
                    bar_height = WAVEFORM_HEIGHT_HIGH
                elif track.height == appconsts.TRACK_HEIGHT_NORMAL:
                    y_pad = WAVEFORM_PAD_LARGE
                    bar_height = WAVEFORM_HEIGHT_LARGE
                elif track.height == appconsts.TRACK_HEIGHT_SMALL:
                    y_pad = WAVEFORM_PAD_SMALL
                    bar_height = WAVEFORM_HEIGHT_SMALL
                
                # Draw all frames only if pixels per frame > 2, otherwise.
                # draw only every other or fewer frames.
                draw_pix_per_frame = pix_per_frame
                if draw_pix_per_frame < 2:
                    draw_pix_per_frame = 2
                    step = int(2 // pix_per_frame)
                    if step < 1:
                        step = 1
                else:
                    step = 1

                # Draw only frames in display.
                draw_first = clip_in
                draw_last = clip_out + 1
                if clip_start_frame < 0:
                    draw_first = int(draw_first - clip_start_frame)
                if draw_first + width_frames < draw_last:
                    draw_last = int(draw_first + width_frames) + 1

                # Get media frame 0 position in screen pixels.
                media_start_pos_pix = scale_in - clip_in * pix_per_frame
                
                # Draw level bar for each frame in draw range.
                for f in range(draw_first, draw_last, step):
                    try:
                        x = media_start_pos_pix + f * pix_per_frame
                        h = bar_height * clip.waveform_data[f]
                        if h < 1:
                            h = 1
                        cr.rectangle(x, y + y_pad + (bar_height - h), draw_pix_per_frame, h)
                    except:
                        # This is just dirty fix a when 23.98 fps does not work.
                        break

                cr.fill()
                cr.restore()

            # Draw proxy indicator.
            if scale_length > FILL_MIN:
                if (not clip.is_blanck_clip) and proxy_paths.get(clip.path) != None:
                    if clip.selected:
                        cr.set_source_rgb(*PROXY_STRIP_COLOR_SELECTED)
                    else:
                        cr.set_source_rgb(*PROXY_STRIP_COLOR)

                    cr.rectangle(scale_in, y, scale_length, 8)
                    cr.fill()

            # Draw text and filter, sync icons.
            if scale_length > TEXT_MIN and clip.is_blanck_clip == False:
                if not hasattr(clip, "rendered_type"):
                    # Text
                    cr.save()

                    cr.rectangle(scale_in, y, scale_length - 3, track_height)
                    cr.clip()

                    cr.set_source_rgba(*CLIP_TEXT_COLOR_OVERLAY)
                    cr.select_font_face ("sans-serif",
                                         cairo.FONT_SLANT_NORMAL,
                                         cairo.FONT_WEIGHT_BOLD)
                    cr.set_font_size(10)
                    if clip.titler_data == None:
                        cr.move_to(scale_in + TEXT_X + text_x_add, y + text_y)
                    else:
                        cr.move_to(scale_in + TEXT_X + 20, y + text_y)
                    cr.show_text(clip.name.upper())
                    
                    cr.restore()
                    
                icon_slot = 0
                # Filter icon.
                if len(clip.filters) > 0:
                    ix, iy = ICON_SLOTS[icon_slot]
                    cr.set_source_surface(FILTER_CLIP_ICON, int(scale_in) + int(scale_length) - ix, y + iy)
                    cr.paint()
                    icon_slot = icon_slot + 1
                # Mute icon.
                if clip.mute_filter != None:
                    icon = AUDIO_MUTE_ICON
                    ix, iy = ICON_SLOTS[icon_slot]
                    cr.set_source_surface(icon, int(scale_in) + int(scale_length) - ix, y + iy)
                    cr.paint()
                    icon_slot = icon_slot + 1

                if callbackbridge.clipeffectseditor_clip_is_being_edited(clip) == True:
                    icon = EDIT_INDICATOR
                    ix =  int(scale_in) + int(scale_length) / 2 - 7
                    iy = y + int(track_height) / 2 - 7
                    cr.set_source_surface(icon, ix, iy)
                    cr.paint()
                if clip.titler_data != None:
                    icon = TITLE_ICON
                    ix = TEXT_X
                    iy = y + int(track_height) / 2 - 7
                    cr.set_source_surface(icon, int(scale_in) + ix, iy)
                    cr.paint()
                    
            # Save sync children data.
            if clip.sync_data != None:
                self.sync_children.append((clip, track, scale_in))

            # Draw clip frame 
            cr.set_line_width(1.0)
            if scale_length > FILL_MIN:
                cr.set_source_rgb(0, 0, 0)
            else:    
                cr.set_source_rgb(0.3, 0.3, 0.3)
                
            self.create_round_rect_path(cr, scale_in,
                                         y + 0.5, scale_length, 
                                         track_height)
            cr.stroke()
        
            # No further drawing for blank clips.
            if clip.is_blanck_clip:
                clip_start_frame += clip_length
                continue

            # Draw sync offset value
            if scale_length > FILL_MIN: 
                if clip.sync_data != None:
                    if clip.sync_data.sync_state != appconsts.SYNC_CORRECT:
                        cr.set_source_rgb(*SYNC_OFF_COLOR)
                        cr.rectangle(scale_in + 2, y + track_height - 13, 26, 13)
                        cr.fill()

                        if abs(clip.sync_diff) > 999:
                            centering = -3
                        elif abs(clip.sync_diff) > 99:
                            centering = 0
                        elif abs(clip.sync_diff) > 9:
                            centering = 3
                        else:
                            centering = 6
                                                    
                        cr.set_source_rgb(1, 1, 1)
                        cr.select_font_face ("sans-serif",
                                             cairo.FONT_SLANT_NORMAL,
                                             cairo.FONT_WEIGHT_NORMAL)
                        cr.set_font_size(9)
                        cr.move_to(scale_in + TEXT_X + centering, y + track_height - 3)
                        cr.show_text(str(clip.sync_diff))

            if clip.waveform_data == None and editorstate.display_all_audio_levels == True and scale_length > FILL_MIN:
                if clip.media_type != appconsts.IMAGE and clip.media_type != appconsts.IMAGE_SEQUENCE and clip.media_type != appconsts.PATTERN_PRODUCER:
                    cr.set_source_surface(LEVELS_RENDER_ICON, int(scale_in) + 4, y + 8)
                    cr.paint()

            # Clip markers.
            if len(clip.markers) > 0 and scale_length > TEXT_MIN:
                for marker in clip.markers:
                    name, clip_marker_frame = marker
                    if clip_marker_frame >= clip.clip_in and clip_marker_frame <= clip.clip_out + 1:
                        marker_x = (clip_start_frame + clip_marker_frame - clip.clip_in) * pix_per_frame
                        cr.set_source_surface(CLIP_MARKER_ICON, int(marker_x) - 4, y)
                        cr.paint()

            # Container clip render status.
            if clip.container_data != None and hasattr(clip.container_data, "progress") and clip.container_data.progress != None:
                display_progress = clip.container_data.progress
            elif hasattr(clip, "render_progress") and clip.render_progress != None:
                display_progress = clip.render_progress
            else:
                display_progress = None

            if display_progress != None:
                cr.set_source_rgb(1, 1, 1)
                cr.select_font_face ("sans-serif",
                                     cairo.FONT_SLANT_NORMAL,
                                     cairo.FONT_WEIGHT_BOLD)
                cr.set_font_size(14)
                cr.move_to(int(scale_in + scale_length / 2.0 - 12), int(y + track_height / 2.0 + 5))
                cr.show_text(str(int(display_progress * 100)) + "%")
                        
            # Get next draw position.
            clip_start_frame += clip_length

        # Fill rest of track with bg color if needed.
        scale_in = clip_start_frame  * pix_per_frame
        if scale_in < width:
            cr.rectangle(scale_in + 0.5, y + 1, width - scale_in, track_height - 1)
            cr.set_source_rgb(*BG_COLOR)  
            cr.fill()

        # Draw track label.
        if track.info_label != "":
            layout = PangoCairo.create_layout(cr)
            text = track.info_label
            desc = Pango.FontDescription("Sans Bold 10")
            layout.set_text(text, -1)
            layout.set_font_description(desc)
            w, h = layout.get_size()
            width = w / Pango.SCALE
            self.create_round_rect_path(cr, 6, y + 4, width + 8, 16, radius=4.0)
            cr.set_source_rgba(0.9, 0.9, 0.9, 0.6)  
            cr.fill()
            cr.move_to(11, y + 2)
            cr.set_source_rgba(0.2, 0.2, 0.2, 0.8)  
            PangoCairo.update_layout(cr, layout)
            PangoCairo.show_layout(cr, layout)

        
    def draw_compositors(self, cr):
        if current_sequence().compositing_mode == appconsts.COMPOSITING_MODE_STANDARD_FULL_TRACK:
            return
            
        compositors = current_sequence().get_compositors()
        for comp in compositors:
            # compositor clip and edge
            track = current_sequence().tracks[comp.transition.b_track]
            target_track =  current_sequence().tracks[comp.transition.a_track]
            
            y = _get_track_y(track.id) + track.height - COMPOSITOR_HEIGHT_OFF

            scale_in = (comp.clip_in - pos) * pix_per_frame
            scale_length = (comp.clip_out - comp.clip_in + 1) * pix_per_frame # +1, out inclusive
            target_y = _get_track_y(target_track.id) + target_track.height - COMPOSITOR_HEIGHT_OFF
                
            self.draw_arrow_compositor(comp, cr, scale_in, scale_length, y, target_y)
                
    def draw_arrow_compositor(self, comp, cr, scale_in, scale_length, y, target_y):
        _create_compositor_cairo_path(cr, scale_in, scale_length, y, target_y)

        if comp.selected == False:
            color = COMPOSITOR_CLIP
        else:
            color = COMPOSITOR_CLIP_SELECTED
            
        cr.set_source_rgba(*color)
        
        cr.fill_preserve()

        cr.set_source_rgb(0, 0, 0)
        cr.set_line_width(1.0)
        cr.stroke()

        # text
        cr.save()

        cr.rectangle(scale_in + 0.5,
                     y + 0.5, scale_length, 
                     COMPOSITOR_HEIGHT)
        cr.clip()
        cr.new_path()
        cr.set_source_rgb(1, 1, 1)
        cr.select_font_face ("sans-serif",
                             cairo.FONT_SLANT_NORMAL,
                             cairo.FONT_WEIGHT_NORMAL)

        cr.set_font_size(11)
        cr.move_to(scale_in + COMPOSITOR_TEXT_X, y + COMPOSITOR_TEXT_Y)
        cr.show_text(comp.name.upper())
        
        cr.restore()

    def draw_standard_mode_compositor(self, comp, cr, scale_in, scale_length, y, target_y):
        x_draw, y_draw, width, height = _get_standard_mode_compositor_rect(scale_in, scale_length, y)
        
        radius = 4.0
        degrees = M_PI / 180.0

        cr.new_sub_path()
        
        # First two corners of round rect
        cr.arc(x_draw + width - radius, y_draw + radius, radius, -90 * degrees, 0 * degrees)
        cr.arc(x_draw + width - radius, y_draw + height - radius, radius, 0 * degrees, 90 * degrees)

        # Arrow
        scale_in = x_draw + width / 2.0 - COMPOSITOR_TRACK_ARROW_WIDTH / 2.0 - 5.5
        start_y = y_draw + height

        COMPOSITOR_TRACK_SMALL_ARROW_WIDTH = 4
        COMPOSITOR_TRACK_SMALL_ARROW_HEAD_WIDTH = 8
        COMPOSITOR_TRACK_SMALL_ARROW_HEAD_WIDTH_HEIGHT = 4
        
        cr.line_to(scale_in + 0.5 + COMPOSITOR_TRACK_X_PAD + 2 * COMPOSITOR_TRACK_SMALL_ARROW_WIDTH, start_y + 0.5 )
        cr.line_to(scale_in + 0.5 + COMPOSITOR_TRACK_X_PAD + 2 * COMPOSITOR_TRACK_SMALL_ARROW_WIDTH, target_y + 0.5 - COMPOSITOR_TRACK_SMALL_ARROW_HEAD_WIDTH_HEIGHT)
        cr.line_to(scale_in + 0.5 + COMPOSITOR_TRACK_X_PAD + COMPOSITOR_TRACK_SMALL_ARROW_WIDTH + COMPOSITOR_TRACK_SMALL_ARROW_HEAD_WIDTH, target_y + 0.5 - COMPOSITOR_TRACK_SMALL_ARROW_HEAD_WIDTH_HEIGHT)
        cr.line_to(scale_in + 0.5 + COMPOSITOR_TRACK_X_PAD + COMPOSITOR_TRACK_SMALL_ARROW_WIDTH, target_y + 0.5)
        cr.line_to(scale_in + 0.5 + COMPOSITOR_TRACK_X_PAD + COMPOSITOR_TRACK_SMALL_ARROW_WIDTH - COMPOSITOR_TRACK_SMALL_ARROW_HEAD_WIDTH, target_y + 0.5 - COMPOSITOR_TRACK_SMALL_ARROW_HEAD_WIDTH_HEIGHT)
        cr.line_to(scale_in + 0.5 + COMPOSITOR_TRACK_X_PAD, target_y + 0.5 - COMPOSITOR_TRACK_SMALL_ARROW_HEAD_WIDTH_HEIGHT)
        cr.line_to(scale_in + 0.5 + COMPOSITOR_TRACK_X_PAD, start_y + 0.5 )

        # Last two corners of round rect
        cr.arc(x_draw + radius, y_draw + height - radius, radius, 90 * degrees, 180 * degrees)
        cr.arc(x_draw + radius, y_draw + radius, radius, 180 * degrees, 270 * degrees)
        
        cr.close_path()
                
        if comp.selected == False:
            color = COMPOSITOR_CLIP_AUTO_FOLLOW
        else:
            color = COMPOSITOR_CLIP_SELECTED
            
        cr.set_source_rgba(*color)
        
        cr.fill_preserve()

        cr.set_source_rgb(0, 0, 0)
        cr.set_line_width(1.0)
        cr.stroke()

        cr.set_source_surface(COMPOSITOR_ICON, x_draw - 2, y_draw + 2)
        cr.paint()
    
    def draw_sync_relations(self, cr):
        if editorpersistance.prefs.show_sync == False:
            return

        radius = 4
        small_radius = 2
        pad = 6
        degrees = M_PI / 180.0
        for child_data in self.sync_children:
            child_clip, track, child_x = child_data
            child_y = _get_track_y(track.id)
            try:
                parent_x, parent_track_id = self.parent_positions[child_clip.sync_data.master_clip.id]
                parent_y = _get_track_y(parent_track_id)
            except KeyError: # parent clip not in tline view, don't draw - think about another solution
                continue

            cr.set_line_width(2.0)
            cr.set_source_rgb(0.1, 0.1, 0.1)
            cr.move_to(child_x + pad, child_y + pad)
            cr.line_to(parent_x + pad, parent_y + pad)
            cr.stroke()
            
            cr.move_to(child_x + pad, child_y + pad)
            cr.arc (child_x + pad, child_y + pad, radius, 0.0 * degrees, 360.0 * degrees)
            cr.fill()
            
            cr.set_source_rgb(0.9, 0.9, 0.9)
            cr.move_to(child_x + pad, child_y + pad)
            cr.arc (child_x + pad, child_y + pad, small_radius, 0.0 * degrees, 360.0 * degrees)
            cr.fill()

            cr.set_source_rgb(0.1, 0.1, 0.1)
            cr.move_to(parent_x + pad, parent_y + pad)
            cr.arc(parent_x + pad, parent_y + pad, radius,  0.0 * degrees, 360.0 * degrees)
            cr.fill()

            cr.set_source_rgb(0.9, 0.9, 0.9)
            cr.move_to(parent_x + pad, parent_y + pad)
            cr.arc(parent_x + pad, parent_y + pad, small_radius,  0.0 * degrees, 360.0 * degrees)
            cr.fill()
    
    def create_round_rect_path(self, cr, x, y, width, height, radius=4.0):
        degrees = M_PI / 180.0
        cr.new_sub_path()
        cr.arc(x + width - radius, y + radius, radius, -90 * degrees, 0 * degrees)
        cr.arc(x + width - radius, y + height - radius, radius, 0 * degrees, 90 * degrees)
        cr.arc(x + radius, y + height - radius, radius, 90 * degrees, 180 * degrees)
        cr.arc(x + radius, y + radius, radius, 180 * degrees, 270 * degrees)
        cr.close_path()


class TimeLineColumn:
    """
    GUI component for displaying and editing track parameters.
    """

    def __init__(self, active_listener, center_listener, double_click_listener):
        # Init widget
        self.widget = cairoarea.CairoDrawableArea2( COLUMN_WIDTH, 
                                                    HEIGHT, 
                                                    self._draw)
        self.widget.press_func = self._press_event
 
        self.double_click_listener = double_click_listener       
        self.active_listener = active_listener
        self.center_listener = center_listener
        self.init_listeners()

    # ------------------------------- MOUSE EVENTS
    def init_listeners(self):
        self.track_testers = []
        
        # Add track click testers
        # track zero is ignored black bg track
        for i in range(1, len(current_sequence().tracks) - 1): # black and hidden tracks are ignored
            start =  _get_track_y(i)
            end = start + current_sequence().tracks[i].height
            tester = ValueTester(start, end, self.track_hit)
            tester.data.track = i
            self.track_testers.append(tester)
        
        # Add switch click testers
        self.switch_testers = []

        # Active area tester
        center_width = COLUMN_WIDTH -  ACTIVE_SWITCH_WIDTH
        tester = ValueTester(center_width, COLUMN_WIDTH, 
                             self.active_listener)
        self.switch_testers.append(tester)

        # Center area tester
        # NOTE: There was a left column of active areas similar to active switch
        # so this is still called 'center' even when it is the left side of two active 
        # areas.
        tester = ValueTester(0, COLUMN_WIDTH - ACTIVE_SWITCH_WIDTH, 
                             self.center_listener)
        self.switch_testers.append(tester)

    def _press_event(self, event):
        """
        Mouse button callback
        """
        if event.n_press == 2:
            for tester in self.track_testers:
                if tester.is_hit(event.y):
                    self.double_click_listener(tester.data.track)
                    return
            return
         
        self.event = event
        for tester in self.track_testers:
            tester.data.x = event.x # pack x value to go
            tester.data.event = event
            tester.call_listener_if_hit(event.y)

    def track_hit(self, data):
        """
        Called when a track has been hit.
        Call appropriate switch press listener, mute or active switch
        """
        for tester in self.switch_testers:
            tester.data.track = data.track # pack track index to go
            tester.data.event = data.event
            tester.call_listener_if_hit(data.x)
    
    # --------------------------------------------- DRAW
    def _draw(self, event, cr, allocation):
        x, y, w, h = allocation
        # Draw bg
        cr.set_source_rgb(*THEME_NEUTRAL_COLUMN_BG_COLOR)
        cr.rectangle(0, 0, w, h)
        cr.fill()

        # This can get called during loads by expose events.
        if editorstate.project_is_loading == True:
            return

        # get insert track
        insert_track_index = current_sequence().get_first_active_track().id
        
        # Draw tracks
        for i in range(1, len(current_sequence().tracks) - 1):
            y = int(_get_track_y(i))
            is_insert_track = (insert_track_index==i)
            self.draw_track(cr, current_sequence().tracks[i], y, is_insert_track)
 
    def draw_track(self, cr, track, y, is_insert_track):
        # Draw track info area.
        center_width = COLUMN_WIDTH - ACTIVE_SWITCH_WIDTH
        rect = (1, y, center_width + 1, track.height)
        grad = cairo.LinearGradient (0, y, 0, y + track.height)
        self._add_gradient_color_stops(grad, track)
        cr.rectangle(*rect)
        cr.set_source(grad)
        cr.fill()
        self.draw_edge(cr, rect)
        
        # Draw active switch bg end edge.
        rect = (center_width - 1, y, ACTIVE_SWITCH_WIDTH + 1, track.height)
        cr.rectangle(*rect)
        if track.active:
            if track == current_sequence().get_first_active_track():
                cr.set_source_rgb(*COLUMN_ACTIVE_COLOR)
            else:
                grad = cairo.LinearGradient(center_width, y,
                                            center_width, y + track.height)
                self._add_gradient_color_stops(grad, track)
                cr.set_source(grad)
        else:
            cr.set_source_rgb(*COLUMN_NOT_ACTIVE_COLOR)
        cr.fill()
        self.draw_edge(cr, rect)

        # Draw track name.
        layout = PangoCairo.create_layout(cr)
        text = utils.get_track_name(track, current_sequence())
        desc = Pango.FontDescription("Sans Bold 10")
        layout.set_text(text, -1)
        layout.set_font_description(desc)

        cr.set_source_rgb(*TRACK_NAME_COLOR)
        if track.height == appconsts.TRACK_HEIGHT_HIGH:
            text_y = ID_PAD_Y_HIGH
        elif track.height == appconsts.TRACK_HEIGHT_NORMAL:
            text_y = ID_PAD_Y
        elif track.height == appconsts.TRACK_HEIGHT_SMALL:
            text_y = ID_PAD_Y_SMALL
        cr.move_to(ID_PAD_X, y + text_y)
        PangoCairo.update_layout(cr, layout)
        PangoCairo.show_layout(cr, layout)
        
        # Draw mute icon.
        mute_icon = None
        if track.mute_state == appconsts.TRACK_MUTE_VIDEO and track.type == appconsts.VIDEO:
            mute_icon = MUTE_VIDEO_ICON
        elif track.mute_state == appconsts.TRACK_MUTE_AUDIO and track.type == appconsts.VIDEO:
            mute_icon = MUTE_AUDIO_ICON
        elif track.mute_state == appconsts.TRACK_MUTE_ALL and track.type == appconsts.AUDIO:
            mute_icon = MUTE_AUDIO_A_ICON
        elif track.mute_state == appconsts.TRACK_MUTE_ALL:
            mute_icon = MUTE_ALL_ICON
        elif track.type == appconsts.VIDEO:
            mute_icon = TRACK_ALL_ON_V_ICON
        else:
            mute_icon = TRACK_ALL_ON_A_ICON
            
        if mute_icon != None:
            ix, iy = MUTE_ICON_POS
            if track.height == appconsts.TRACK_HEIGHT_HIGH:
                ix, iy = MUTE_ICON_POS_HIGH
            elif track.height == appconsts.TRACK_HEIGHT_NORMAL:
                ix, iy = MUTE_ICON_POS_NORMAL
            elif track.height == appconsts.TRACK_HEIGHT_SMALL:
                ix, iy = MUTE_ICON_POS
            cr.set_source_surface(mute_icon, int(ix), int(y + iy))
            cr.paint()

        # Draw locked icon.
        if track.edit_freedom == appconsts.LOCKED:
            if track.height == appconsts.TRACK_HEIGHT_HIGH: 
                ix, iy = LOCK_POS_HIGH
            elif track.height == appconsts.TRACK_HEIGHT_NORMAL:
                ix, iy = LOCK_POS
            elif track.height == appconsts.TRACK_HEIGHT_SMALL:
                ix, iy = LOCK_POS_SMALL
            cr.set_source_surface(FULL_LOCK_ICON, ix, int(y + iy))
            cr.paint()
        
        # Draw insert arrow.
        if is_insert_track == True:
            if track.height == appconsts.TRACK_HEIGHT_HIGH:
                ix, iy = INSRT_ICON_POS_HIGH
            elif track.height == appconsts.TRACK_HEIGHT_NORMAL:
                ix, iy = INSRT_ICON_POS
            elif track.height == appconsts.TRACK_HEIGHT_SMALL:
                ix, iy = INSRT_ICON_POS_SMALL
            cr.set_source_surface(INSERT_ARROW_ICON, ix, y + iy)
            cr.paint()

        # Draw audio level info.

        if track.audio_gain != 1.0:
            pcs_str = str(int(round(track.audio_gain * 100.0))) + "%"
            # Draw track name
            layout = PangoCairo.create_layout(cr)
            desc = Pango.FontDescription("Sans 8")
            layout.set_text(pcs_str, -1)
            layout.set_font_description(desc)
            cr.set_source_rgb(*TRACK_NAME_COLOR)
            if track.height == appconsts.TRACK_HEIGHT_HIGH:
                text_y = ID_PAD_Y_HIGH + 2
            elif track.height == appconsts.TRACK_HEIGHT_NORMAL:
                text_y = ID_PAD_Y + 2
            elif track.height == appconsts.TRACK_HEIGHT_SMALL:
                text_y = ID_PAD_Y_SMALL + 2
            #if track.parent_track != None:
            xadd = 24
            #else:
            #     xadd = 31
            cr.move_to(ID_PAD_X + xadd, y + text_y)
            PangoCairo.update_layout(cr, layout)
            PangoCairo.show_layout(cr, layout)

        if track.parent_track != None:
            if track.height == appconsts.TRACK_HEIGHT_HIGH:
                ix, iy = SYNC_ICON_POS_HIGH
            elif track.height == appconsts.TRACK_HEIGHT_NORMAL:
                ix, iy = SYNC_ICON_POS
            elif track.height == appconsts.TRACK_HEIGHT_SMALL:
                ix, iy = SYNC_ICON_POS_SMALL
                
            cr.set_source_surface(SYNC_ICON, ix, y + iy)
            cr.paint()
            
        
    def _add_gradient_color_stops(self, grad, track):
        if track.id == current_sequence().first_video_index: 
            grad.add_color_stop_rgba(*TRACK_GRAD_ORANGE_STOP1)
            grad.add_color_stop_rgba(*TRACK_GRAD_ORANGE_STOP3)
        else:
            grad.add_color_stop_rgba(*TRACK_GRAD_STOP1)
            grad.add_color_stop_rgba(*TRACK_GRAD_STOP3)

    def draw_edge(self, cr, rect):
        cr.set_line_width(1.0)
        cr.set_source_rgb(0, 0, 0)
        cr.rectangle(rect[0] + 0.5, rect[1] + 0.5, rect[2] - 1, rect[3])
        cr.stroke()


class TimeLineFrameScale:
    """
    GUI component for displaying frame tme value scale.
    """

    def __init__(self, set_default_callback, mouse_scroll_listener):
        self.widget = cairoarea.CairoDrawableArea2( MINIMUM_WIDTH,
                                                    SCALE_HEIGHT, 
                                                    self._draw)
        self.widget.press_func = self._press_event
        self.widget.motion_notify_func = self._motion_notify_event
        self.widget.release_func = self._release_event
        self.widget.mouse_scroll_func = mouse_scroll_listener
        self.drag_on = False
        self.set_default_callback = set_default_callback

        #self.font_desc = Pango.FontDescription("Bitstream Vera Sans Mono Condensed " + str(8))
        
        global FRAME_SCALE_SELECTED_COLOR_GRAD, FRAME_SCALE_SELECTED_COLOR_GRAD_L, MARK_COLOR 
        FRAME_SCALE_SELECTED_COLOR_GRAD = DARK_FRAME_SCALE_SELECTED_COLOR_GRAD
        FRAME_SCALE_SELECTED_COLOR_GRAD_L = DARK_FRAME_SCALE_SELECTED_COLOR_GRAD_L
        MARK_COLOR = DARK_MARK_COLOR

    def _press_event(self, event):
        if event.button == 1 or event.button == 3:
            if not timeline_visible():
                callbackbridge.updater_display_sequence_in_monitor()
                return
            callbackbridge.trimmodes_set_no_edit_trim_mode()
            frame = current_sequence().get_seq_range_frame(get_frame(event.x))
            PLAYER().seek_frame(frame)
            self.drag_on = True

    def _motion_notify_event(self, x, y, state):
        if((state & Gdk.ModifierType.BUTTON1_MASK)
           or(state & Gdk.ModifierType.BUTTON3_MASK)):
            if self.drag_on:
                frame = current_sequence().get_seq_range_frame(get_frame(x))
                PLAYER().seek_frame(frame) 
                
    def _release_event(self, event):
        if self.drag_on:
            frame = current_sequence().get_seq_range_frame(get_frame(event.x))
            PLAYER().seek_frame(frame) 
            callbackbridge.clipeffectseditor_update_kfeditors_sliders(frame)
        self.drag_on = False

    # --------------------------------------------- DRAW
    def _draw(self, event, cr, allocation):
        """
        Callback for repaint from CairoDrawableArea.
        We get cairo context and allocation.
        """
        x, y, w, h = allocation

        # Draw grad bg
        grad = self._get_dark_theme_grad(h)

        cr.set_source(grad)
        cr.rectangle(0,0,w,h)
        cr.fill()

        # This can get called during loads by unwanted expose events
        if editorstate.project_is_loading == True:
            return

        # Get sequence and frames per second value
        seq = current_sequence()
        fps = seq.profile.fps()

        # Selected range
        if seq.tractor.mark_in != -1 and seq.tractor.mark_out != -1:
            in_x = (seq.tractor.mark_in - pos) * pix_per_frame
            out_x = (seq.tractor.mark_out + 1 - pos) * pix_per_frame
            cr.set_source_rgba(*SELECTED_RANGE_COLOR)
            cr.rectangle(in_x,0,out_x-in_x,h)
            cr.fill()

        max_range = 3
        size_adj = 1

        # Draw start indicator triangles
        if pos == 0:
            cr.set_source_rgb(*FRAME_SCALE_LINES)
            start_y = 1
            tri_h = 8
            tri_h_half = tri_h / 2
            tri_w = 8

            for i in range(0, max_range):
                cr.move_to (0, start_y + i * tri_h)
                cr.line_to (tri_w, start_y + i * tri_h + tri_h_half)
                cr.line_to (0, start_y + i * tri_h + tri_h)
                cr.close_path()
                cr.fill()

        # Set line attr for frames lines
        cr.set_source_rgb(*FRAME_SCALE_LINES)
        cr.set_line_width(1.0)
        
        big_tick_step = -1 # this isn't rendered most ranges, -1 is flag

        # Get displayed frame range
        view_start_frame = pos
        view_end_frame = int(pos + w / pix_per_frame)

        # Get draw steps for marks and tc texts
        if fps < 20:
            spacer_mult = 2 # for fps like 15 this looks bad without some help
        else:
            spacer_mult = 1
    
        text_x_off = TC_X_OFF
        if pix_per_frame > DRAW_THRESHOLD_1:
            small_tick_step = 1
            big_tick_step = fps / 2
            tc_draw_step = (fps * spacer_mult)  / 2
            if pix_per_frame < 9.0:
                tc_draw_step = fps * spacer_mult
            text_x_off = 4
        elif pix_per_frame > DRAW_THRESHOLD_2:
            small_tick_step = fps * spacer_mult
            tc_draw_step = fps * spacer_mult
        elif pix_per_frame > DRAW_THRESHOLD_3:
            small_tick_step = fps * 2 * spacer_mult
            tc_draw_step = fps * 2 * spacer_mult
        elif pix_per_frame > DRAW_THRESHOLD_4:
            small_tick_step = fps * 3 * spacer_mult
            tc_draw_step = fps * 3 * 2
        else:
            view_length = view_end_frame - view_start_frame
            small_tick_step = int(view_length / NUMBER_OF_LINES)
            tc_draw_step = int(view_length / NUMBER_OF_LINES)

        # Draw tc
        cr.select_font_face ("monospace",
                              cairo.FONT_SLANT_NORMAL,
                              cairo.FONT_WEIGHT_NORMAL)

        cr.set_font_size(11)
        
        # Draw small tick lines and tc texts.
        # Get draw range in steps from 0
        start = int(view_start_frame / small_tick_step)
        if start * small_tick_step == pos:
            start += 1 # don't draw line on first pixel of scale display
        # +1 to ensure coverage
        end = int(view_end_frame / small_tick_step) + 1 
        for i in range(start, end):
            x = math.floor(i * small_tick_step * pix_per_frame - pos * pix_per_frame) + 0.5 
            cr.move_to(x, SCALE_HEIGHT*size_adj)
            cr.line_to(x, SMALL_TICK_Y)
            #cr.set_source_rgb(*FRAME_SCALE_LINES)
            cr.stroke()
            if tc_draw_step == small_tick_step:
                cr.move_to(x + text_x_off, TC_Y)
                text = utils.get_tc_string(int(round(float(i) * float(tc_draw_step))))
                cr.set_source_rgb(*FRAME_SCALE_TEXT)
                cr.show_text(text)

        cr.set_source_rgb(*FRAME_SCALE_LINES)
        
        # 23.98 and 29.97 need this to get drawn on even seconds with big ticks and tcs
        if round(fps) != fps:
            to_seconds_fix_add = 1.0
        else:
            to_seconds_fix_add = 0.0
        
        # Draw big tick lines, if required
        if big_tick_step != -1:
            start = int(view_start_frame / big_tick_step)
            if start * big_tick_step == pos:
                start += 1 # don't draw line on first pixel of scale display
            # +1 to ensure coverage
            end = int(view_end_frame / big_tick_step) + 1 
            for i in range(start, end):
                x = math.floor((math.floor(i * big_tick_step) + to_seconds_fix_add) * pix_per_frame \
                    - pos * pix_per_frame) + 0.5 
                cr.move_to(x, SCALE_HEIGHT*size_adj)
                cr.line_to(x, 5)
                cr.stroke()

        if tc_draw_step != small_tick_step:
            start = int(view_start_frame / tc_draw_step)
            # Get draw range in steps from 0
            if start == pos:
                start += 1 # don't draw line on first pixel of scale display
            # +1 to ensure coverage
            end = int(view_end_frame / tc_draw_step) + 1 
            for i in range(start, end):
                x = math.floor((math.floor(i * tc_draw_step) + to_seconds_fix_add) * pix_per_frame \
                    - pos * pix_per_frame) + 0.5
                cr.move_to(x + text_x_off, TC_Y)
                text = utils.get_tc_string(int(math.floor((float(i) * tc_draw_step) + to_seconds_fix_add)))
                cr.set_source_rgb(*FRAME_SCALE_TEXT)
                cr.show_text(text)
                
        cr.set_source_rgb(*FRAME_SCALE_LINES)
        
        # Draw marks
        self.draw_mark_in(cr, h)
        self.draw_mark_out(cr, h)
        
        # Draw markers
        for i in range(0, len(seq.markers)):
            marker_name, marker_frame = seq.markers[i]
            x = math.floor(_get_frame_x(marker_frame))
            cr.set_source_surface(MARKER_ICON, x - 4, 15)
            cr.paint()

        # Select draw colors and frame based on mode
        if EDIT_MODE() != editorstate.SLIDE_TRIM or PLAYER().looping():
            current_frame = PLAYER().tracktor_producer.frame()
        else:
            current_frame = fake_current_frame

        if timeline_visible():
            cr.set_source_rgb(0, 0, 0)
            line_color = (0, 0, 0)
        else:
            current_frame = editorstate.tline_shadow_frame
            line_color = (0.8, 0.8, 0.8)

        disp_frame = current_frame - pos
        frame_x = math.floor(disp_frame * pix_per_frame) + 0.5
        cr.set_source_rgb(*line_color)
        cr.move_to(frame_x, 0)
        cr.line_to(frame_x, h)
        cr.stroke()

        # Draw pos triangle
        cr.set_source_surface(TC_POINTER_HEAD, frame_x - 7.5, 0)
        cr.paint()

    def draw_mark_in(self, cr, h):
        """
        Draws mark in graphic if set.
        """
        mark_frame = current_sequence().tractor.mark_in
        if mark_frame < 0:
            return
             
        x = _get_frame_x(mark_frame)

        cr.move_to (x, MARK_PAD)
        cr.line_to (x, h - MARK_PAD)
        cr.line_to (x - 2 * MARK_LINE_WIDTH, h - MARK_PAD)
        cr.line_to (x - 1 * MARK_LINE_WIDTH, 
                    h - MARK_LINE_WIDTH - MARK_PAD) 
        cr.line_to (x - MARK_LINE_WIDTH, h - MARK_LINE_WIDTH - MARK_PAD )
        cr.line_to (x - MARK_LINE_WIDTH, MARK_LINE_WIDTH + MARK_PAD)
        cr.line_to (x - 1 * MARK_LINE_WIDTH, MARK_LINE_WIDTH + MARK_PAD )
        cr.line_to (x - 2 * MARK_LINE_WIDTH, MARK_PAD)
        cr.close_path()

        cr.set_source_rgb(*MARK_COLOR)
        cr.fill_preserve()
        cr.set_source_rgb(0,0,0)
        cr.stroke()
        
    def draw_mark_out(self, cr, h):
        """
        Draws mark out graphic if set.
        """
        mark_frame = current_sequence().tractor.mark_out
        if mark_frame < 0:
            return
             
        x = _get_frame_x(mark_frame + 1)

        cr.move_to (x, MARK_PAD)
        cr.line_to (x, h - MARK_PAD)
        cr.line_to (x + 2 * MARK_LINE_WIDTH, h - MARK_PAD)
        cr.line_to (x + 1 * MARK_LINE_WIDTH, 
                    h - MARK_LINE_WIDTH - MARK_PAD) 
        cr.line_to (x + MARK_LINE_WIDTH, h - MARK_LINE_WIDTH - MARK_PAD )
        cr.line_to (x + MARK_LINE_WIDTH, MARK_LINE_WIDTH + MARK_PAD)
        cr.line_to (x + 1 * MARK_LINE_WIDTH, MARK_LINE_WIDTH + MARK_PAD )
        cr.line_to (x + 2 * MARK_LINE_WIDTH, MARK_PAD)
        cr.close_path()

        cr.set_source_rgb(*MARK_COLOR)
        cr.fill_preserve()
        cr.set_source_rgb(0,0,0)
        cr.stroke()

    """
    def draw_text(self, cr, frame_str, x, y):
        layout = PangoCairo.create_layout(cr)
        layout.set_text(frame_str, -1)
        layout.set_font_description(self.font_desc)

        cr.set_source_rgb(*FRAME_SCALE_TEXT)
        cr.move_to(x - 1, y) # fine-tuning x positioning here to just do it once

        PangoCairo.update_layout(cr, layout)
        PangoCairo.show_layout(cr, layout)
        
        cr.set_source_rgb(*FRAME_SCALE_LINES)
    """
    
    def _get_dark_theme_grad(self, h):
        r, g, b = FRAME_SCALE_NEUTRAL_BG_COLOR
        grad = cairo.LinearGradient (0, 0, 0, h)
        grad.add_color_stop_rgba(1, r, g, b, 1)
        grad.add_color_stop_rgba(0, r, g, b, 1)

        return grad


class TimeLineYPage:
    """
    GUI component for displaying and editing track parameters.
    """

    def __init__(self, up_button_listener, down_button_listener):
        # Init widget
        self.widget = cairoarea.CairoDrawableArea2( Y_SCROLL_WIDTH, 
                                                    HEIGHT, 
                                                    self._draw)
        self.widget.press_func = self._press_event
        self.widget.motion_notify_func = self._motion_notify_event
        self.widget.leave_notify_func = self._leave_notify_event
        self.widget.enter_notify_func = self._enter_notify_event
        self.widget.set_tooltip_markup(_("Up - Page Up\nDown - Page Down"))
        
        self.up_button_listener = up_button_listener
        self.down_button_listener = down_button_listener

        # tlineypage.py uses these also to see if page up/down should be done. 
        self.up_active = False
        self.down_active = False

        self.mouse_prelight = False
        self.mouse_pos = None
        
    # --------------------------------------------- PRESS
    def set_active_state(self, up_active, down_active):
        self.up_active = up_active
        self.down_active = down_active
        
        self.widget.queue_draw()
    
    def _press_event(self, event):
        alloc = self.widget.get_allocation()
        if event.button == 1 or event.button == 3:
            if event.y < alloc.height // 2:
                if self.up_active == True:
                    self.up_button_listener()
            else:
                if self.down_active == True:
                    self.down_button_listener()

    def _motion_notify_event(self, x, y, state):
        self.mouse_pos = (x, y)
        self.widget.queue_draw()
        
    def _enter_notify_event(self, event):
        self.mouse_prelight = True
        self.mouse_pos = None
        
    def _leave_notify_event(self, event):
        self.mouse_prelight = False
        self.mouse_pos = None
        self.widget.queue_draw()
    
    # --------------------------------------------- DRAW
    def _draw(self, event, cr, allocation):
        x, y, w, h = allocation
        # Draw bg
        cr.set_source_rgb(*Y_SCROLL_BG)
        cr.rectangle(0, 0, w, h)
        cr.fill()

        h_half = (h - 2) // 2
        radius = 4.0
        
        rect = (0, 1, w, h_half)
        self.create_round_rect_path(cr, 0, 1, w, h_half, radius)
        self.draw_edge(cr, rect)

        h_half = (h - 2) // 2
        rect = (0, 1 + h_half, w, h_half)
        self.create_round_rect_path(cr, 0, 1 + h_half, w, h_half + 1, radius)
        self.draw_edge(cr, rect)

        if self.up_active == True:
            icon = INSERT_ARROW_ICON_UP
        else:
            icon = INSERT_ARROW_ICON_UP_INACTIVE 
        cr.set_source_surface(icon, 2, h_half // 2 - 2)
        cr.paint()
        
        if self.down_active == True:
            icon = INSERT_ARROW_ICON
        else:
            icon = INSERT_ARROW_ICON_INACTIVE 
        cr.set_source_surface(icon, 2, h_half + h_half // 2 - 2)
        cr.paint()

        if self.mouse_prelight == True and self.mouse_pos != None:
            mx, my = self.mouse_pos
            if my < h / 2:
                ly = 0
            else:
                ly =  h / 2

            cr.set_source_rgba(0.5, 0.5, 0.5, 0.2)
            self.create_round_rect_path(cr, 1, ly + 2, w - 2, h / 2 - 2, radius)
            cr.rectangle(0 + 1, ly + 2, w - 2, h / 2 - 2)
            cr.fill()

    def draw_edge(self, cr, rect):
        cr.set_line_width(1.0)
        cr.set_source_rgb(0.105, 0.105, 0.105)
        cr.stroke()

    def create_round_rect_path(self, cr, x, y, width, height, radius=2.0):
        degrees = M_PI / 180.0
        cr.new_sub_path()
        cr.arc(x + width - radius, y + radius, radius, -90 * degrees, 0 * degrees)
        cr.arc(x + width - radius, y + height - radius, radius, 0 * degrees, 90 * degrees)
        cr.arc(x + radius, y + height - radius, radius, 90 * degrees, 180 * degrees)
        cr.arc(x + radius, y + radius, radius, 180 * degrees, 270 * degrees)
        cr.close_path()



class KFToolFrameScale:
    
    def __init__(self, line_color):
        self.line_color = line_color
    
    def draw(self, cr, clip_start_in_timeline, clip_length, ytop, ybottom):
        # Get frames per second value
        seq = current_sequence()
        fps = seq.profile.fps()
        
        # Get frame draw range
        view_start_frame = clip_start_in_timeline
        view_end_frame = clip_start_in_timeline + clip_length

        # Get draw steps for marks and tc texts
        if fps < 20:
            spacer_mult = 2 # for fps like 15 this looks bad with out some help
        else:
            spacer_mult = 1

        big_tick_step = -1 # this isn't rendered most ranges, -1 is flag
      
        # Decide on draw steps based zoom level     
        if pix_per_frame > DRAW_THRESHOLD_1:
            small_tick_step = 1
            big_tick_step = fps / 2
            tc_draw_step = (fps * spacer_mult)  / 2
        elif pix_per_frame > DRAW_THRESHOLD_2:
            small_tick_step = fps * spacer_mult
            tc_draw_step = fps * spacer_mult
        elif pix_per_frame > DRAW_THRESHOLD_3:
            small_tick_step = fps * 2 * spacer_mult
            tc_draw_step = fps * 2 * spacer_mult
        elif pix_per_frame > DRAW_THRESHOLD_4:
            small_tick_step = fps * 3 * spacer_mult
            tc_draw_step = fps * 3 * 2
        else:
            end_frame = int(pos + gui.tline_canvas.widget.get_allocation().width / pix_per_frame)
            view_length = end_frame - pos
            small_tick_step = int(view_length / NUMBER_OF_LINES)
            tc_draw_step = int(view_length / NUMBER_OF_LINES)

        # TC font
        cr.select_font_face ("sans-serif",
                              cairo.FONT_SLANT_NORMAL,
                              cairo.FONT_WEIGHT_NORMAL)
        cr.set_font_size(11)


        # Set line attrs for frames lines
        cr.set_source_rgb(*self.line_color)
        cr.set_line_width(1.0)
        
        # 23.98 and 29.97 need this to get drawn on even seconds with big ticks and tcs
        if round(fps) != fps:
            to_seconds_fix_add = 1.0
        else:
            to_seconds_fix_add = 0.0

        # Draw lines and TC
        # Draw big tick lines, if required
        if big_tick_step != -1:
            count = int(seq.get_length() / big_tick_step)
            for i in range(1, count):
                if ((i * big_tick_step) + to_seconds_fix_add) < clip_start_in_timeline:
                    continue 
                if ((i * big_tick_step) + to_seconds_fix_add) > (clip_start_in_timeline + clip_length):
                    continue 
                
                x = math.floor((math.floor(i * big_tick_step) + to_seconds_fix_add) * pix_per_frame \
                    - pos * pix_per_frame) + 0.5 
                cr.move_to(x, ytop)
                cr.line_to(x, ybottom)
                cr.stroke()
        else:
            if tc_draw_step != small_tick_step:
                start = int(view_start_frame / tc_draw_step)
                # Get draw range in steps from 0
                if start <= clip_start_in_timeline:
                    start += 1 # don't draw line on first pixel of scale display
                # +1 to ensure coverage
                end = int(view_end_frame / tc_draw_step) + 1 
                for i in range(start, end):

                    x = math.floor((math.floor(i * tc_draw_step) + to_seconds_fix_add) * pix_per_frame \
                        - pos * pix_per_frame) + 0.5
                    
                    cr.move_to(x, ytop)
                    cr.line_to(x, ybottom)
                    cr.stroke()
            else:
                # Get draw range in steps from 0
                start = int(view_start_frame / small_tick_step)
                if start * small_tick_step <= clip_start_in_timeline:
                    start += 1 # don't draw line on first pixel of scale display
                # +1 to ensure coverage
                end = int(view_end_frame / small_tick_step) + 1 
                for i in range(start, end):
                    x = math.floor(i * small_tick_step * pix_per_frame - pos * pix_per_frame) + 0.5 
                    cr.move_to(x, ytop)
                    cr.line_to(x, ybottom)
                    cr.stroke()


class TimeLineScroller(Gtk.HScrollbar):
    """
    Scrollbar for timeline.
    """
    def __init__(self, scroll_listener):
        GObject.GObject.__init__(self)
        
        adjustment = Gtk.Adjustment(value=0.0, lower=0.0, upper=100.0, step_increment=1.0, page_increment=10.0, page_size=30.0)
        adjustment.connect("value-changed", scroll_listener)
        self.set_adjustment(adjustment)


class ValueTester:
    """
    Calls listener if test value in hit range.
    """
    def __init__(self, start, end, listener):
        self.start = start
        self.end = end
        self.listener = listener
        self.data = utils.EmptyClass()
        
    def call_listener_if_hit(self, value):
        if value >= self.start and value <= self.end:
            self.listener(self.data)

    def is_hit(self, value):
        if value >= self.start and value <= self.end:
            return True
        else:
            return False
            
